Crex is one of the supporting antagonists in the 2002 animated Disney film, Treasure Planet.
He is an alien pirate in John Silver's crew who seems to be an orange anthropomorphic anglerfish with a "T-Rex" complexion. He was involved in the raid on the Benbow Inn, being one of the first two pirates (the other being Verne) to storm inside before Silver entered himself. During the voyage, the ship encounters a supernova. Jim (while securing lifelines of all pirates) saves Silver from falling just in time. The supernova then devolves into a black hole, where Arrow falls. The burst of shock waves and maximum engine power enable Amelia to pilot the ship to safety. Amelia mourns the loss of Arrow, and suspects Jim of failing to secure the lifelines, while Arrow's line was actually cut by Scroop. It is unknown what had happened to Crex in the film, as his last appearance was sleeping at a campsite where he, Silver, and several of the other pirates were sleeping.
- His name is based the name "Rex" from the largest carnivorous dinosaur, Tyrannosaurus Rex.