Crex is an orange anthropomorphic anglerfish with a "T-Rex" complexion.
Crex 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. While securing lifelines of all pirates so that they will not get lost, Jim saves Silver from falling just in time. The supernova then devolves into a black hole, where Arrow falls to his death. 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 the most dangerous insectoid alien named 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 there.
- His name is based on the name "Rex" from the largest carnivorous dinosaur Tyrannosaurus Rex.
- Crex is the second pirate in John Silver's crew to have an unknown fate.