Clark opens up to Lois about his ongoing struggle with visions and admits that there is only one person who might be able to help. Meanwhile, Lana receives some unexpected news and tensions begin to rise between Lois and Chrissy. Lastly, Sarah breaks plans with Jordan to spend time with Natalie.

Lana, Kyle and Sarah prepare for Sarah's quinceañera, but things don't end up going as smoothly as they had hoped. Clark finds himself struggling with feelings of guilt about what happened to John Irons and Lois worries that she might have been wrong about Ally. Meanwhile, Jonathan learns that Ret. General Samuel Lane is planning to train Jordan. Lastly, Chrissy goes searching for the truth about Lois.

Lois tells Clark that she and Chrissy plan to do a deeper dive into the Inverse Society and Lana and Sarah try to comfort each other after the fallout at Sarah's quinceañera. Meanwhile, Jordan notices something suspicious in Jonathan's book bag. Lastly, Lt. Mitch Anderson finds himself under fire for the deterioration of the department of defense's relationship with Superman.

Superman pleads with Lt. Anderson to investigate Ally Allston and Lois receives some very upsetting news. Meanwhile, Lois helps Lana prepare to fight the good fight. Lastly, Jordan is still irritated with Jonathan for lying to him.

Superman races through the portal after Ally Allston, but when he arrives on the other side, he discovers everything on this parallel earth is... bizarre. Navigating his way through deceivingly familiar faces and landscapes, Superman goes on one wild ride in his fight to stop Ally from merging.

A weary Lois holds vigil at Superman’s bedside. Meanwhile, Jonathan and Jordan continue to worry about their father who seems more human now than ever. Lastly, John Henry and Natalie work together to figure out the best way to defend against Ally Allston’s powers.

Clark and Lois are now working at the Smallville Gazette together and enjoying small town life, as Chrissy struggles to balance a new love interest and her friendship with Lois. However, Lois’ own work-life balance is put to the test when an undercover assignment reveals a deadly foe that promises to change the Kent family forever. Meanwhile, John Henry is haunted by his doppelgänger’s past, leading to dangerous consequences for him and Natalie. Lana Lang and Kyle redefine their family post-separation, while Sarah explores what the future holds for her and Jordan now that she knows the truth about his powers. Having learned the hard way that no one else can be trusted to work with Superman, General Samuel Lane reclaims his post at the Department of Defense, only to face his own conflict in working with his grandson, Jordan.

Lois and Clark dig deeper on Bruno Mannheim, starting with his connections to Hob's Bay Medical Center, while Jonathan and Jordan panic at home over Lois' dire diagnosis. Meanwhile, Matteo comes to Smallville to meet John Henry for the first time, and Sarah and Chrissy start to break the ice.