Leonardo is a fictional character portrayed by Seth Green in the TV series Teenage Mutant Ninja Turtles.
In the first episode they appeared in, titled Within the Woods (season 3), they were 40 years old.
They appear in 70 episodes out of a total of 124 aired and have accumulated 1980 positive votes.
The character of Leonardo is mainly associated with Donatello, Raphael and Michelangelo.
Leonardo is also portrayed by Jason Biggs and Dominic Catrambone.
Episodes70
Within the Woods
episode S3.E1 october 2014After being provoked from stopping the Kraang invasion and being outmatched by Shredder and Kraang Prime, April, Casey and the Turtles take refuge inside a cabin far from the city in the woods.A Foot Too Big
episode S3.E2 october 2014When the Turtles discover Bigfoot in the woods, Donnie befriends it and insists they protect it from a hunter.Buried Secrets
episode S3.E3 october 2014The turtles find an old alien spacecraft that is connected to April's past.The Croaking
episode S3.E4 november 2014Mikey runs away and befriends a mutant frog. Only to learn the frog and his family have nefarious plans.In Dreams
episode S3.E5 november 2014The turtles get trapped in their dreams by Dream beavers. They can't escape except with the help of a man.Race with the Demon
episode S3.E6 november 2014When Casey and Donatello work together to build a hot rod, a mutant challenges them.Eyes of the Chimera
episode S3.E7 january 2015When Casey, Raph, Mikey, and Donnie are captured by a new mutant, April and Leo must overcome disabilities in order to save them.Vision Quest
episode S3.E8 january 2015Leo takes the Turtles to train in the woods in an advanced ninja ritual; the Turtles must overcome their weaknesses and face their enemies to become a true ninja.Return to New York
episode S3.E9 january 2015The turtles return to New York, facing the Kraang and Kraang Prime for a rematch to see who New York really belongs to.Serpent Hunt
episode S3.E10 february 2015As the Turtles search for Karai, they must deal with a city filled with Kraang and Shredder.The Pig and the Rhino
episode S3.E11 march 2015Donnie finishes a new batch of Retro-Mutagen in hope of saving Karai; the Turtles are hunted by Shredder's new henchmen, Bebop and Rocksteady.Battle for New York: Part 1
episode S3.E12 march 2015Leo is suspicious when Slash emerges leading a team called the Mighty Mutanimals; the Turtles must brave the bizarre world of Dimension X to save the enslaved people of New York.Battle for New York: Part 2
episode S3.E13 march 2015Leo is suspicious when Slash emerges leading a team called the Mighty Mutanimals; the Turtles must brave the bizarre world of Dimension X to save the enslaved people of New York.Casey Jones vs. The Underworld
episode S3.E14 march 2015Casey Jones thinks he can take on the criminal underworld on his own, but soon discovers that he is in over his head.The Noxious Avenger
episode S3.E15 april 2015A new mutant called Muckman starts to gain notoriety as NYC's "Monster Hero".Clash of the Mutanimals
episode S3.E16 may 2015The Shredder kidnaps and experiments on the Mighty Mutanimals.Meet Mondo Gecko
episode S3.E17 may 2015Michelangelo meets Mondo Gecko, a skateboarding mutant, and tries to save him from being condemned to a life of crime.The Deadly Venom
episode S3.E18 may 2015When Karai is brainwashed, she begins hunting the Turtles.Turtles in Time
episode S3.E19 august 2015The Turtles travel back in time and must help a young sorceress stop a dreadful warrior.Tale of the Yokai
episode S3.E20 august 2015The Turtles end up in Japan's past and must save a young Hamato Yoshi.Attack of the Mega Shredder!
episode S3.E21 august 2015Leonardo decides to sneak into Shredder's lair alone, and winds up facing the biggest mutant threat yet.The Creeping Doom
episode S3.E22 august 2015After an accident, Donnie finds himself slowly losing his intelligence.The Fourfold Trap
episode S3.E23 september 2015The Turtles are baited by an unknown enemy into deadly traps.Dinosaur Seen in Sewers!
episode S3.E24 september 2015Raph makes a new friend named Zog, an alien dinosaur. But Zog is hiding a dark secret.Annihilation: Earth! Part 1
episode S3.E25 september 2015When the turtles get word of the Kraang's return, they realize there is an even bigger threat coming to Earth.Annihilation: Earth! Part 2
episode S3.E26 september 2015When the turtles get word of the Kraang's return, they realize there is an even bigger threat coming to Earth.Beyond the Known Universe
episode S4.E1 october 2015The Turtles experience outer space and alien life for the first time.The Moons of Thalos 3
episode S4.E2 november 2015When the team crash lands on an ice moon along with an enemy, all must put their differences aside to survive.The Weird World of Wyrm
episode S4.E3 november 2015Casey Jones accidentally unleashes a fourth-dimensional being called Wyrm.The Outlaw Armaggon
episode S4.E4 november 2015Lord Dregg sets a fearsome bounty hunter, the shark mutant Armaggon, on the trail of the Turtles.Riddle of the Ancient Aeons
episode S4.E5 january 2016The team must journey through an ancient alien temple to get a piece of the black hole generator.But they get an ancient star which marks the AeonsJourney to the Center of Mikey's Mind
episode S4.E6 january 2016When microscopic aliens invade Mikey's mind, the Turtles have to chase them through the strange world of Mikey's subconscious.The Arena of Carnage
episode S4.E7 january 2016The turtles are captured and thrown into the Triceratons' battle area.The War for Dimension X
episode S4.E8 january 2016The Turtles must gain the trust of the Utrom Council in order to find the next piece of the black hole generator.The Cosmic Ocean
episode S4.E9 march 2016The Turtles journey through the cosmic ocean of Varuna, where they must proves themselves worthy to Hiidalra. Hiidalra is an aquatic alien queen who holds the second piece of the black hole generator.Trans-Dimensional Turtles
episode S4.E10 march 2016In the most cowabunga crossover ever, the 2012 and 1987 Turtles team up to stop the Krang from tinkering with dimensions.Revenge of the Triceratons
episode S4.E11 april 2016Donatello is feeling inferior to the Fugitoid, but his intellect is put to the test when the Triceratons attack.The Evil of Dregg
episode S4.E12 april 2016When Raphael loses his fighting mojo, he must overcome his feelings to save his brothers from certain doom.The Ever-Burning Fire
episode S4.E13 april 2016The team must overcome impossible odds in order to obtain the final Black Hole Generator piece.Earth's Last Stand
episode S4.E14 april 2016As the team finally reaches Earth, the Fugitoid reveals a horrible secret about his past.City at War
episode S4.E15 august 2016April faces a deadly, new enemy when she graduates to full Kunoichi; the Turtles must deal with the return of some old foes.Broken Foot
episode S4.E16 august 2016When Leonardo secretly allied himself with Karai, he gets himself into deeper danger than he could have realized.The Insecta Trifecta
episode S4.E17 august 2016The team faces Stockman-Fly's new insect minions, and Raph has to man up to overcome his fear of insects and lead the team.Mutant Gangland
episode S4.E18 september 2016Don Vizioso's gang tracks the Turtles with a slew of Anti-Mutant weapons.Bat in the Belfry
episode S4.E19 september 2016Michelangelo befriends some odd, new superheroes named Wingnut and Screwloose.The Super Shredder
episode S4.E20 november 2016For the first time, the Turtles encounter something they cannot defeat... The Super Shredder!Darkest Plight
episode S4.E21 november 2016The Turtle team hunts for their Sensei, but soon realizes they are being hunted as well.The Power Inside Her
episode S4.E22 november 2016Donatello becomes concerned and decides to test April, only to discover that her psychic abilities are rapidly growing in power.Tokka vs. The World
episode S4.E23 february 2017When Tokka returns after her presumable death, she finds out that her baby has been taken from her. After realizing this she violently searches for her lost baby.The Tale of Tiger Claw
episode S4.E24 february 2017A dangerous female mutant, by the name of Alopex, appears with a personal vendetta against Tiger Claw. The Turtles, April and Casey try to befriend her, but turns on them and furiously goes after Tiger Claw alone. Unfortunately for her, Tiger Claw has prepared for her unexpected arrival.Requiem
episode S4.E25 february 2017Super Shredder has returned with even greater vengeance, forcing the Turtles to enlist the combined aid of Splinter, April, Casey, Karai, Shinigami and the Mighty Mutanimals to destroy him once and for all.Owari
episode S4.E26 february 2017With the demise of their beloved father and Karai incapacitated, the turtles, April, and Casey infiltrate Super Shredder's new lair to put an end to Oroku Saki once and for all, no matter what it takes.Scroll of the Demodragon
episode S5.E1 march 2017The team faces a new enemy with mystical powers named Kavaxas.The Forgotten Swordsman
episode S5.E2 march 2017Karai searches for the Kuro Kabuto, claiming to be the rightful heir to the Foot Clan, when she encounters an old rival.Heart of Evil
episode S5.E3 april 2017Donnie's grudge with Don Vizioso threatens the Turtles' newest mission.End Times
episode S5.E4 april 2017The Turtles must defeat the mighty demodragon Kavaxas to prevent him from destroying the world.When Worlds Collide
episode S5.E5 june 2017The Newtralizer returns to New York City more powerful than ever before and joins forces with a dangerous, yet unexpected ally. With the help of Mona Lisa, the Turtles fight back to defend their city.When Worlds Collide Part 2
episode S5.E6 june 2017The Newtralizer returns to New York City more powerful than ever before and joins forces with a dangerous, yet unexpected ally. With the help of Mona Lisa, the Turtles fight back to defend their city.Yojimbo
episode S5.E7 july 2017The Turtles are transported to an alternate dimension, where they befriend the rabbit samurai and master swordsman: Miyamoto Usagi.Osoroshi No Tabi - Scary Journey
episode S5.E8 july 2017Usagi leads the Turtles through a haunted forest, where they end up encountering mischievous and highly dangerous spirits.Kagayakei Kintaro
episode S5.E9 august 2017As they reach their destination, Usagi and the Turtles must help young Kintaro fulfill his destiny.Lone Rat and Cubs
episode S5.E10 august 2017The turtles tell the back story behind their creation.Carmaggedon
episode S5.E13 september 2017After gaining the loyalty of both the Badger and Scale Tail Clans, Raph, Donbot, Mikey, and Kira head to Oasis. But, Maximus Kong is on their tails, and harboring a secret.The Curse of Savanti Romero
episode S5.E14 september 2017Renet returns to ask the Turtles for help, to stop Savanti Romero from unleashing an undead army on Modern-day New York.The Crypt of Dracula
episode S5.E15 september 2017Count Dracula is awakened, and turns Raphael into a vampire.The Frankenstein Experiment
episode S5.E16 october 2017Savanti recruits Frankenstein's Monster and will soon unleash his creatures on the 21st Century.Monsters Among Us!
episode S5.E17 october 2017Upon returning to present-day New York City, Renet and the Turtles discover (much to their horror) that the dystopian zombie-infested city is ruled by even more monsters, vampires and zombies than before, realizing that their previous failures to defeat Savanti when they had the chance has made the mishap plummet from bad to even worse. After returning to the safety of their underground sewer lair, they have one last chance to have order restored, but when their lair is discovered and trashed by Savanti's monster tribe, who infect Donnie and turn him into a vampire in the chaos of the brawl, things become even worse.Wanted: Bebop and Rocksteady
episode S5.E18 november 2017The 1987 Shredder and Krang recruit the 2012 Bebop and Rocksteady, finding them better than their own incompetent counterparts.The Foot Walks Again!
episode S5.E19 november 2017The Turtles must train their 1980s selves to fight back against a massive threat. The danger is bigger than any of them have encountered before, so they must be prepared.The Big Blow Out
episode S5.E20 november 2017The 1980s Shredder and Krang employ Rocksteady and Bebop and discover that their plans are working out better than they ever thought when they travel dimensions.
- Within the Woods
- A Foot Too Big
- Buried Secrets
- The Croaking
- In Dreams
- Race with the Demon
- Eyes of the Chimera
- Vision Quest
- Return to New York
- Serpent Hunt
- The Pig and the Rhino
- Battle for New York: Part 1
- Battle for New York: Part 2
- Casey Jones vs. The Underworld
- The Noxious Avenger
- Clash of the Mutanimals
- Meet Mondo Gecko
- The Deadly Venom
- Turtles in Time
- Tale of the Yokai
- Attack of the Mega Shredder!
- The Creeping Doom
- The Fourfold Trap
- Dinosaur Seen in Sewers!
- Annihilation: Earth! Part 1
- Annihilation: Earth! Part 2
- Beyond the Known Universe
- The Moons of Thalos 3
- The Weird World of Wyrm
- The Outlaw Armaggon
- Riddle of the Ancient Aeons
- Journey to the Center of Mikey's Mind
- The Arena of Carnage
- The War for Dimension X
- The Cosmic Ocean
- Trans-Dimensional Turtles
- Revenge of the Triceratons
- The Evil of Dregg
- The Ever-Burning Fire
- Earth's Last Stand
- City at War
- Broken Foot
- The Insecta Trifecta
- Mutant Gangland
- Bat in the Belfry
- The Super Shredder
- Darkest Plight
- The Power Inside Her
- Tokka vs. The World
- The Tale of Tiger Claw
- Requiem
- Owari
- Scroll of the Demodragon
- The Forgotten Swordsman
- Heart of Evil
- End Times
- When Worlds Collide
- When Worlds Collide Part 2
- Yojimbo
- Osoroshi No Tabi - Scary Journey
- Kagayakei Kintaro
- Lone Rat and Cubs
- Carmaggedon
- The Curse of Savanti Romero
- The Crypt of Dracula
- The Frankenstein Experiment
- Monsters Among Us!
- Wanted: Bebop and Rocksteady
- The Foot Walks Again!
- The Big Blow Out
Best moments10
- The Turtles journey through the cosmic ocean of Varuna, where they must proves themselves worthy to Hiidalra. Hiidalra is an aquatic alien queen who holds the second piece of the black hole generator.
- When Karai is brainwashed, she begins hunting the Turtles.
- With the demise of their beloved father and Karai incapacitated, the turtles, April, and Casey infiltrate Super Shredder's new lair to put an end to Oroku Saki once and for all, no matter what it takes.
- Leo takes the Turtles to train in the woods in an advanced ninja ritual; the Turtles must overcome their weaknesses and face their enemies to become a true ninja.
- As the Turtles search for Karai, they must deal with a city filled with Kraang and Shredder.
- The Turtles are transported to an alternate dimension, where they befriend the rabbit samurai and master swordsman: Miyamoto Usagi.
- After being provoked from stopping the Kraang invasion and being outmatched by Shredder and Kraang Prime, April, Casey and the Turtles take refuge inside a cabin far from the city in the woods.
- When Casey, Raph, Mikey, and Donnie are captured by a new mutant, April and Leo must overcome disabilities in order to save them.
- Leo is suspicious when Slash emerges leading a team called the Mighty Mutanimals; the Turtles must brave the bizarre world of Dimension X to save the enslaved people of New York.
- The turtles return to New York, facing the Kraang and Kraang Prime for a rematch to see who New York really belongs to.
- The Cosmic Ocean
- The Deadly Venom
- Owari
- Vision Quest
- Serpent Hunt
- Yojimbo
- Within the Woods
- Eyes of the Chimera
- Battle for New York: Part 1
- Return to New York