"Rainbow Monkey Kong" (voiced by Frank Welker) was a giant, real-life Rainbow Monkey that Numbuh 4 encountered on the mysterious Rainbow Monkey Island in Operation: H.U.G.S.. Being a Rainbow Monkey, it was naturally loving and peaceful despite its ferocious appearance, which Wally did not approve of and attempted to train the monkey to be feral. This did not work until Numbuh 4 gave up, insulted the monkey and left without giving it a hug, making it very angry and causing it to follow him and attack the Sector V Treehouse.


  • The creature is based on King Kong.

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