Commander Lyle Tiberius Rourke is the main antagonist of Disney's 2001 animated feature film Atlantis: The Lost Empire. Prior to the main events of the film, he was the Commander of a previous mission to Iceland where he assisted Milo Thatch's grandfather, Thaddeus, in locating the Shepherd's Journal. He is one of the very few Disney villains who does not initially appear to be evil, but gradually shows his villainy over the course of the film. This, however, is also true for Jafar from Aladdin and Clayton from Tarzan. He initially appears as a very reliable and praiseworthy commander, able to lead his men through perils, but as the film progresses, he turns out to be a highly manipulative, ruthless and sadistic mercenary who is out to capture the Heart of Atlantis and make money off of it.