While former "Hulk" muscleman
Lou Ferrigno had to cancel due to filming, Charlie showed up to sign his name alongside
Monkees men
Mickey Dolenz and
Peter Tork, along with three former cast members of "Buffy the Vampire Slayer." Charlie made his debut at the Wizard World Convention in Minneapolis, with convention insiders confirming he's set to do at least two more appearances over the summer.