Codename: Kids Next Door (2002)

S3E22 Operation: S.P.R.O.U.T.

When Numbuh 4 unwittingly consumes a brussels sprout, the rest of the KND spring into action, embarking on a high-stakes mission to prevent the dreaded vegetable from being digested. Their wild adventure takes them on a thrilling journey inside Numbuh 4's body, where they must navigate various obstacles to save him from the fate of the infamous sprout.