Ever since Mon-El crash landed on Earth in Supergirl, the show's audience has been eagerly anticipating one thing: the arrival of the Legion of Super-Heroes. According to comic-book lore, the Legion consisted of super-powered teens battling evil in the 31st century. Their first appearance in April 1958's Adventure Comics #247 featured founding members Saturn Girl, Cosmic Boy and Lightning Lad traveling back in time to recruit Superboy.
As the Legion's roster expanded, Mon-El eventually joined the group and served as one of their most dedicated members. Due to a technicality in the Legion's laws, Supergirl was denied membership until much later on. Nonetheless, both characters share such a strong history with the Legion that it only seemed inevitable before the team was established in the TV series. Well, the wait is finally over.
In tonight's episode of Supergirl, "Wake Up," a missing Mon-El returns along with two special friends – the telepath Saturn Girl and the 12th level intellect, Brainiac 5. On a recent Supergirl set visit, Melissa Benoist acknowledged the importance of introducing these characters and their legacy.
"The fact that the Legion is coming to the show, it has such a hold in the comic-book world, especially with Superman and Martian Manhunter, specifically," Benoist said. "That's really exciting for us. For Kara, it's a brand-new set of problems that you see pretty quickly."
Traditionally, Supergirl and Braniac 5 enjoyed a lengthy romance in the comic books. Whether sparks fly when the two meet remains to be seen.
"We've only just introduced the two of them with what we're working on now," explained Benoist. "I can't really tease anything, though."
Then, there's Mon-El. In the season-two finale, the Daxamite prince was forced to flee the planet after Supergirl triggered a lead-dispersal device to defeat his mother and his people. Mon-El was last seen being sucked into a wormhole. A heartbroken Kara has struggled with his absence, so their reunion should be all hugs and kisses. Except, it isn't.
"This season, we've really delved into a different tone, a different atmosphere, for Kara," Benoist said. "She's really figuring out her own alien-ess, if you will. In turn, I think she is finding her womanhood through grief. It won't be the reunion you expect."
Chyler Leigh confirmed "there's a skepticism" surrounding Mon-El's reappearance.
"It's not an easy pill to swallow," Leigh noted. "For Alex, she's always going to be protective of her sister. They are trying to wrap their minds around what that looks like. And, with the Legion coming, you never have a down, or dull, moment. Everything comes in and it all falls down at once. There's not a lot of time for dwelling."