 He first appeared unobscured by his hood in South Park : Bigger , Longer & Uncut , where it was revealed that he had messy golden hair . In a cameo appearance during this moment in the film , Mike Judge provided the voice for Kenny 's one line of uninsulated dialogue : " Goodbye , you guys . " On a few occasions during episodes that have originally aired since the film 's release , he has been seen without the parka ; however , unlike in Bigger , Longer & Uncut his entire face has been only seen once in the television series without being partially obscured or otherwise altered , this being in The Losing Edge . He also speaks unmuffled during some of these instances , in which case co @-@ producer Eric Stough provides Kenny 's voice . During " The Coon " episodes of seasons 13 and 14 , Kenny has his first major speaking role as the character Mysterion . 
