When on an island to repair a Joe vehicle, Bazooka sees a sea serpent, part of Cobra's plan to control the sea lanes, but when the serpent's remote is accidentally destroyed, it soon becomes an out of control, and very ravenous machine.
While on a camping trip, Bazooka watches a monstrous creature rise from the water and devour what looks like a giant firefly. Unfortunately, none of the Joes believe him, until it's revealed that this "sea serpent" is a Cobra-built submarine!