DC's Legends of Tomorrow has been a solid addition to The CW's weekly superhero programming and will surely look to up the ante in the recently announced, season 2. A new report from TV Line states, "Rumor has it the final scene of Legends of Tomorrow‘s May 19 season finale will introduce a “beloved superhero from the DC canon” whose mysterious agenda serves as “a launching off point for Season 2."
Given the time travel nature of the show, who do you think this mystery character could be? The description sounds a lot like Rip Hunter's role in season 1 so perhaps it's another Time Master? Could it be Booster Gold?