William Moseley, who is best known for his role as Peter Pevensie in the The Chronicles of Narnia movies, recently gave fans an eyeful when he made an appearance on G4′s American Ninja Warrior.

Eagle-eyed viewers say the now-25-year-old’s performance on the obstacle course game show wasn’t the only thing impressive–the bulge in his shorts was, too!

After failing to complete one part of the course, Moseley plunged into the water, and his wet clothes revealed the outline of something enormous. Maybe there’s a lion in there? Nah, looks more like a horse.

What do you think? Is it an athletic support underwear or a big ‘ol peter?

No doubt some of the training in his upcoming Parkour action flick Run came in handy.

Video and caps after the jump!