The Mutant Captain was the head of Governor Kolp's military. He was tasked with catching or killing the visitors from Ape City who had found their way into the mutant complex. Failing, he took two men with him to locate the ape settlement. Reporting back to Kolp, they then prepared their soldiers to invade. The Captain directed much of the battle, but in defeat he was either captured alive by Caesar's apes or killed, like Kolp, by Aldo's gorilla cavalry.
- In an unfilmed scene, the Captain tries to organise an efficient retreat by the mutant forces, perhaps more aware of their situation than the increasingly insane Kolp.