|Royce "Cave Guy" Mumphry|
Sergeant Mike Cosgrove
|First appearance||"Dance of Doom"|
|Voiced by||Jeff Glen Bennett|
Cave Guy is a very intelligent blue caveman with upper-class diction education,and taste. His real name is Royce Mumphry; he is wanted in five states, and he subscribes to The New Yorker. His enemies are Freakazoid, Sergeant. Mike Cosgrove, Roddy MacStew and The Huntsman. In season 2 to he dates Cobra Queen. He also does not like Sci-Fi conventions. He always goes to the Washington Gardens to eat. He also has the strength of 20 men.