Act 7: Curtain 1
A normal monkey head, during head action is seen holding a banana.
General Monkey's assistant. He started out as the lucky test subject for his boss's serums-- until one potion triggered a fascinating side effect: intelligence. Since then, he has masterminded most of his boss's projects and received zero credit, which in the scientific community is known as "collaboration".
How To Find The Head
When you are fighting General Monkey in space, he will eventually take off his helmet. When he does, hit him in the head and you will get this.