- For the episode, see "".
- Not to be confused with the Legion of Doom.
- For the superhero group in a possible future on Earth-1, see Rebooted Legion.
- "The governments were overwhelmed by violence. By chaos. Mon-El organized us and we banded together to help Earth's leaders keep the peace, at home and in the stars."
- —Imra Ardeen[src]
The Legion are a group of superheroes from the 31st century, founded and led by Mon-El.
The governments in the thirty-first century were overwhelmed by conflict. Mon-El, stranded in this time period, wanted to make a difference, so he formed the Legion. Using the superheroism of the 21st century's Supergirl as an ideal to follow, the Legion's goals were to keep the peace on Earth and in the stars. Imra Ardeen eventually joined, being inspired by the story and legend of Supergirl.
The Legion battled against many alien hybrids that were created from labs to be combat efficient. At one point, Zod had been resurrected and the Legion had to track down some deposits of Kryptonite on Earth to use in battle against him. On another occasion, the Legion seemed to had some sort of interaction with Superman, as it appears Clark has a Legion ring of his own, keeping it on display in the Fortress of Solitude.
While on a mission, the Legion hit a wormhole, and were transported 12,000 years into the past. They decided to put themselves into cryo-sleep until they re-awoke in the thirty-first century, but awoke earlier than anticipated, int the twenty-first century, when a torpedo hit their ship in 2017.
- Mon-El (founder and leader)
- Imra Ardeen/Saturn Girl (telepath)
- Winn Schott (tech support, computer programmer, and hacker)
- Six unnamed members
- Querl Dox/Brainiac 5 (tech support, computer programmer, and hacker; transferred to the Superfriends while his distant relative is dealt with)
- D.E.O. (operating in the present)
- Alex Danvers (director)
- Superfriends (operating in the present)
- Guardian's team (operating in the present)
- James Olsen/Guardian (leader)
- J'onn J'onzz/Martian Manhunter (operating in the present)
- Clark Kent/Superman (implied; operating in the present)
- Children of Juru
- Two of the remaining Six Legionaries are likely Lightning Lad and Cosmic Boy, as they are usually one of the three founding members of the Legion along with Saturn Girl and occasionally Brainiac 5. Mon-El has never been a founding member in any other media.
- It is possible that Phantom Girl, Bouncing Boy and Triplicate Girl are also part of the Legion since after the founding members they are the next main members.
- Mon-El mentions a friend from the 31st century named Alya. This is probably a reference to Lightning Lass (sometimes also known as Light Lass), a fellow member of the Legion.
- Brainy has referenced Nura Nal, who in the DC comics, is known as the Legion member Dream Girl. Nia Nal is stated to be an ancestor of Nura's, and possesses the same powers as Dream Girl. It has yet to be confirmed whether the Arrowverse version of Nura Nal is a member of the Legion or is considered a superhero.
- Mon-El and Saturn Girl are married, in the DC comic books, Imra eventually marries Lightning Lad.
- Nora West-Allen has referred to a hero named Lightning Lad, and Gideon said that she was the fifth recruit of something before Barry cut her off. This could refer to the fact that XS and Lightning Lad were both members of the Legion in the DC comics.
Behind the scenes
- In the DC comics, all incarnations of the Legion of Super-Heroes were founded by Saturn Girl, Lightning Lad and Cosmic Boy.
- Both Superman and Supergirl had been long standing members of the Legion.
- A ring resembling a Legion Flight Ring can be seen in the Fortress of Solitude in the first season episode "". It was seen again in the second-season episode "". A glimpse of a similar ring was also seen on when Barry, Cisco and Harry went through a breach to Earth-2 in "".