The SPEED STINK is a communication gadget, which was used by Numbuh 4 in Operation F.U.T.U.R.E..He used it to call for help from the Kids Next Door against the Girl Squad. This gadget also appeared in Operation: K.A.S.T.L.E. used by Numbuh 1, who was called by Numbuh 3 two times. The first time she called to get them to the Rainbow Monkey Park. The second time was to get them to help them from King Sandy's Guards. It is unknown what this gadget's acronym stands for.