We never thought we’d see this sports star transform into a sea slug.

Leaf Sheep—which just so happens to be a real and very adorable aquatic animal—was revealed to be a NFL legend during The Masked Singer‘s season 12 premiere.

Fellow footballer DeMarcus Ware, who competed as Koala on the Fox singing competition show’s 11th season, introduced Leaf Sheep during the Sept. 25 episode by calling the anonymous celebrity the G.O.A.T.—a.k.a. the greatest of all time. But when it came for Leaf Sheep to tease his real identity, the retired athlete couldn’t help but address his extremely unusual undersea costume first and foremost.

“I know, you’re very confused right now,” he told fans in a video package. “And so was I until about three days ago. But the leaf sheep is a real thing. Look it up.”

Plus, the star noted his costume is actually fitting now that he’s no longer on quarterback duties.