The Monitor sends Harbinger to gather the worlds' greatest heroes - Supergirl, The Flash, Green Arrow, Batwoman, White Canary, The Atom and Superman - in preparation for the impending Crisis. With their worlds in imminent danger, the superheroes suit up for battle while J'onn and Alex recruit Lena to help them find a way to save the people of Earth-38.
Episode rating
Cast of episode
66
33
- Kara Danvers
- Lena Luthor
- The Monitor
- Nia Nal
- Brainiac-5
- Alex Danvers
- Andrea Rojas
- Kelly Olsen
- Eve Teschmacher
- J'onn J'onzz
- Green Arrow
- Sara Lance
- Ray Palmer
- Nash Wells
- Green Arrow
- Superman
- Lois Lane
- Batwoman
- Barry Allen
- Alura Zor-El
- Harbinger
- Dick Grayson
- Alexander Knox
- Trivia Night Host
- Doomsday Protestor
- Acolyte #2
- Running Pedestrian
- Hank Hall
- Ray Terrill
- Jason Todd