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S4:E22 - Operation: F.E.R.A.L.

Operation: F.E.R.A.L.

S4:E22
2005 IMDb

Numbuh 1 is sent to retrieve an important code from Rainbow Monkey Island, but after a run-in with the Delightful Children From Down the Lane, he is left stranded there. Soon, he ends up forgetting who he is and starts behaving like a wild Rainbow Monkey. His teammates become very worried when it appears that there may be no way to cure him.