Numbuh 398 is a guard at the Kids Next Door Moonbase. He wears a pink bucket with a light in it on his head. He works there with Numbuh 116. His first appearance is in Operation: G.R.A.D.U.A.T.E.S..

In Operation: G.R.A.D.U.A.T.E.S., he is seen running twice with other KND operatives.

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