"Trollz" & "Harry and Bunny" (Monster and Muscle Growth Transformations)

All of these clips were supplied by The Male Muscle Growth Archives. 

From Trollz: Snarf, a half-dog, half-ogre creature transforms into a hulking, monstrous ogre in episode three:

In episode four Snarf transforms again while in drag:

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In episode one ("The Orientation") of Harry and Bunny, Harry falls into magical goo and turns into the hulk: