Things may be getting a bit frosty on DC's Legends of Tomorrow's Waverider, if Caity Lotz's Instagram is any indication.

By the end of Legends' midseason finale, two original team members were gone. Martin Stein was written off the show following his death in "Crisis on Earth-X," and Jefferson "Jax" Jackson left to discover who he was without his other half

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Since then, speculation has been brewing about who could fill their spots on the Waverider -- and it's possible that new member just got revealed. Lotz, who plays Sara Lance on the show, posted a selfie on Instagram of her and Danielle Panabaker on set together. Panabaker, who plays Killer Frost on The Flash is wearing her Frost outfit in the pic.

Now, this could very easily just be a photo she took while filming "Crisis on Earth-X," since Panabaker was on the Waverider during the crossover. There's no rule saying that someone has to upload a photo to Instagram the very moment they take it, after all. But it's just as likely Frost may be joining Legends; showrunner Marc Guggenheim is on record as stating the vacancy would be filled by an existing Arrowverse character, after all.

During "Crisis," a good portion of Frost's interactions with other Arrowverse characters were from the Legends corner of the universe. Both Martin and Ray Palmer confided to her several times, Heatwave went out of his way to scare her and trigger her powers, and she fought alongside Zari and Vixen in the final battle. We won't know who actually joins the Legends until the show returns in February, but Frost is looking like a true contender.

Premiering Tuesday nights on The CW, Legends of Tomorrow stars Caity Lotz, Brandon Routh, Tala Ashe, Maisie Richardson-Sellers, Amy Pemberton, Nick Zano, and Dominic Purcell.