Can 'Legends of Tomorrow' Crossover With 'Supergirl,' 'Gotham'?

The 'Arrow'/'Flash' spinoff is set to debut in early 2016.

The CW superhero universe is unleashing its legends.

When the first trailer for Legends of Tomorrow debuted Thursday, it provided plenty of clues about the show's plot — revealing its villain and why its key players come together. The series combines heroes and villains from Arrow and The Flash, which have already enjoyed success with multiple crossovers on the CW.

The series, slated to bow in January or February, will shake up both Arrow and The Flash. But could it also ripple into DC shows not on The CW?


This is the biggest question mark of them all. It's been hinted the shows could crossover, as both hail from Warner Bros. Television and Arrow/Flash executive producers Greg Berlanti and Andrew Kreisberg, but at first glance the CBS series doesn't appear to take place in the same universe as the CW shows. The Supergirl teaser establishes that Superman has been around for awhile in this universe, as Jimmy Olsen (Mehcad Brooks) has already won a Pulitzer Prize for a photograph of Superman, who is Supergirl's (Melissa Benoist) cousin.

See more 'The Flash': Every Major DC Character on The CW Series

In the world of Arrow, it is presumed Oliver Queen is the world's first superhero — and Superman has not been mentioned.  Legends of Tomorrow involves time travel and other wild sci fi elements— so in the event that Supergirl does indeed take place in a separate universe, it's conceivable the team could hop over to her universe. And the idea of multiple universes is a longstanding tradition in DC Comics.   


Fox's Batman prequel is the toughest nut to crack when it comes to a possible crossover with the CW superhero universe. Not only does it take place years before the events of Arrow and The Flash, it doesn't share the same producers as Supergirl does. Though Legends of Tomorrow's time travel element could solve the time difference, the show hasn't introduced superpowered characters like The Flash or Firestorm, which would make it challenging from a story standpoint. 

The trailer has already revealed ways Legends of Tomorrow could shake up Arrow and The Flash:


Legends of Tomorrow features Sara back Sara (Caity Lotz), who died early in Arrow season three when Merlyn (John Barrowman) drugged his daughter Thea (Willa Holland) and tricked her into killing the Black Canary. The trailer shows Sara will be brought back to life via the Lazarus Pit, Ra's al Ghul's supernatural pool that can heal wounds or restore the dead.

Sara's resurrection will have huge implications for Arrow. Season three ended with Oliver (Stephen Amell) helping make Merlyn the new Ra's al Ghul, which means Merlyn controls the Lazarus pit. Reviving Sara could go a long way to help him repair his relationship with Thea, who is haunted by Sara's murder. It could also smooth things over with Sara's former lover (and League of Assassins member) Neesa (Katrina Law) has vowed vengeance. Meanwhile, the relationship between Sara's sister Laurel (Katie Cassidy) and father Quentin (Paul Blackthorne) fell apart after her death, so Sara's return could help things there.

Read more Dissecting 'Legends of Tomorrow': Sara's Return and 4 Other Revelations (Video)

The Legends of Tomorrow trailer suggests Ray Palmer (Brandon Routh) is believed dead after the events of Arrow season three, which saw him vanish in an explosion in his lab. He was really shrinking down in size to become The Atom.

The Flash

When it comes Legends of Tomorrow's ties with The Flash, the big question is Firestorm. The fiery character played a small but important roll in season one, with Dr. Martin Stein (Victor Garber) and Ronnie Raymond (Robbie Amell) currently inhabiting Ronnie's body. Here's the issue: Only Martin Stein is signed up for the show. 

"I'm a half a hero, and my other half is combustible," Stein says in the trailer.

But the trailer does show plenty of that "combustible" nature, suggesting Ronnie might be in the show as a CG character — or somehow Stein has mastered the power of fire.  Next week's The Flash season finale, which shows Ronnie marrying his longtime fiancé Caitlin Snow (Danielle Panabaker), could shed some light on the status of the Firestorm character.

Legends of Tomorrow also has The Flash's Captain Cold (Wentworth Miller) and Heatwave (Dominic Purcell) and Dr. Martin Stein (Victor Garber) on the roll call. Aside from Reverse-Flash (Tom Cavanagh), Captain Cold was Barry's biggest nemesis in season one, so his newfound heroic streak could change his relationship with The Flash.   

How do you think the shows might crossover? Share your theories in the comments.