When it was originally revealed the Wentworth Miller would be returning to Legends of Tomorrow, it was widely reported and assumed that he would be part of the Legion of Doom. That's since proved not to be the case, and he instead only made a few brief appearances as part of Rory's hallucinations. That was done away with when the show returned year, leaving us to assume that's it for Leonard.
Well, perhaps not! Martin Stein indicated that Captain Cold could still be out there after being scattered across time, and unless what we see in the photos below is a flashback, it seems like he could be about to return. Despite the addition of some new team members, it would definitely be good to have him back, though it's entirely possible that some time travel shenanigans could be involved.
We'll just have to wait and see, but be sure to share your Legends of Tomorrow theories down below.