The CW's Legends of Tomorrow were recently dealt a devastating blow when Professor Stein made the ultimate sacrifice in the this year's Arrowverse crossover "Crisis on Earth-X." Fans wondered what this development would mean for Jefferson Jackson who, along with the Professor, comprised one half of Firestorm.

The following episode of Legends of Tomorrow gave us the answer when Jefferson decided to leave the team and the Waverider.

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This means that there are two vacant spots on the team's roster. Not one to leave an empty seat void for long, Arrowverse executive producer Marc Guggenheim has confirmed a new character will join the ranks of the Legends when the show returns from its winter break in February. As it turns out, the new addition is a character we've already seen in the Arrowverse though the identity remains a secret. "I just can’t talk about the game plan," the producer said. "The CW publicity will determine when we get to unleash that bit of news.”

Of course, that won't stop us from going into speculative mode. Here are the five most likely candidates to join the time-traveling adventures of the Legends of Tomorrow.

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The Ray

During "Crisis on Earth-X," viewers were introduced to new superhero, The Ray. Although he was one of the Freedom Fighters held prisoner on Earth-X, he was actually from Earth-One, and paid a brief visit to his home Earth before the crossover was done. The character instantly proved to be a solid addition to the ever-expanding Arrowverse, and is a hero that would be right at home aboard the Waverider. His power set of flight and energy blasts would sufficiently replace the similar powerhouse that Firestorm was on the Legends roster.

Unfortunately, he's pretty much out of the running. Actor Russell Tovey, who brought Ray Terrill to life, is currently occupied starring on ABC's Quantico. However, the Arrowverse producers are keeping a tight lid on the identity of the new Legend. Could it simply be that they're waiting for Quantico to finish its run before announcing the addition of Tovey to the cast?

John Constantine

Matt Ryan's take on John Constantine was so spot-on and popular that the actor managed to transcend universes. The street smart mage shifted from his own cancelled series on NBC to the Arrowverse in Arrow's fourth season. Then, the master of the dark arts helped bring Sara Lance's soul back from the underworld. Now, Ryan is set to visit the Arrowverse once again for a two-episode stint on Legends.

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Matt Ryan as John Constantine on Legends of Tomorrow

Could this simply be a trial run before a series regular status? As an actor, Ryan has his hands full, but it could be that he was only available for two episodes right now. As the actor's availability changes, perhaps he'll join the series full time. In a team of misfits, Constantine would be right at home, and Ryan is on record as wanting to continue to portray the character. Sounds like a match made in... Hell.

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Miss Martian

Miss Martian was introduced in the second season of Supergirl but never got her proper due. The character was essentially a sidekick/love interest to the Martian Manhunter, and she never truly got the chance to shine as a superhero. Adding her to the crew of the Waverider would bring in some much needed wisdom after the departure of Stein, as well as new and useful powers. After all, shape-shifting is an ability that would come in very handy on the Legends' various missions.

Megann Miss Martian

Adding her to Legends would bring in even more girl power to a team that is becoming increasingly more female-oriented. This could further cement a new evolution of the team, with Miss Martian finding a home and family in a group that knows all too well what it means to be an outcast.

Roy Harper

Introduced in the first season of Arrow, Roy Harper evolved from street kid to crime-fighting vigilante. However, he was also forced to live on the run after taking the fall for the Arrow. While we did eventually see Roy as Arsenal, we never got to see him truly explored as a superhero. If Colton Haynes were to return to the Arrowverse via Legends, fans could finally see Red Arrow get his proper due.

Roy Harper Arsenal

Roy, who has always been associated with the Teen Titans in the comics, is a team player, and would make an interesting addition to the Legends roster. The fact that he is not a super-powered individual would add some variety to the Legends' makeup. Plus, it would also make him easier add to such an effects-driven production.

Wally West

Wally West seems to be the most likely candidate to hop aboard the Waverider. On The Flash, the character has always been given the short end of the stick, relegated to a sidekick who doesn't get to do much other than move people out of the way. Wally was recently written off the show for an unspecified amount of time. Could that be because he's slated for bigger and better things on Legends of Tomorrow?

Kid Flash would keep Legends' teenage superhero element alive -- essentially the role Jefferson filled. BThe super-speed visual effects are something that we know the Arrowverse shows handle well, and something that wouldn't be complicated to add to this series. After all, the series already featured a speedster in a regular capacity in the villainous Reverse-Flash.

In the Season 3 premiere of Legends, Wally appeared in a cameo capacity. The short, fun scene hinted at a superhero partnership he had formed with Citizen Steel. Could it be that this was a bit of foreshadowing, and that the seeds for Wally's involvement were planted early on? The signs seem to indicate Firestorm's familiar yellow and red will be replaced by Kid Flash's similar hues.


Legends of Tomorrow returns with all-new episodes Feb. 12, 2018. The series stars Caity Lotz, Brandon Routh, Dominic Purcell, Wentworth Miller, Tala Ashe, Nick Zano, Maisie Richardson-Sellers, Amy Pemberton and Arthur Darvill.