Doom Whip

"Monkey science harnesses doom energy into a single huge whip that does more damage in a wider area"

 is the fourth arm upgrade along the Tech path in Bloons Super Monkey 2. It is purchasable after the upgrade Dual Whips has been purchased and replaces the Super Monkey's dual whips with a single, thicker, purple and black whip. While this is a fairly powerful weapon, it has no effect on Glass Bloons whatsoever unless the player buys research.