Joel Valentine Roar Sound

This's a vocal sound effect often used by Joel Valentine. It might be the voice of Jeff Glenn Bennett, since the monster making this vocal in "Dee-Dee-minsional" is credited with that voice actor.

TV Series

 * Dexter's Laboratory
 * Samurai Jack
 * Wander Over Yonder

Audio Samples
Dexter's Lab "Dee-Dee-minsional", Samurai Jack EPISODE XX (+ various pitches), and WOY "The Waste of Time" are good sources to reference.