There are no details about the character, except that it's a "beloved superhero from the DC canon."
TVLine reports, "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.'
We've already had a ton of beloved characters appear on "Legends," so who could be next? Blue Beetle? Doctor Fate? Mister Miracle? We'll likely have to wait until May 19 to find out...
"Legends of Tomorrow" airs Thursdays at 8/7c on The CW.