Although diminutive in size, Grand Master Yoda is one of the most proficient and thoughtful Jedi warriors. During Order 66, Yoda, manages to escape and go into hiding. Exiling himself to the swampy planet of Dagobah and settling near a cave teeming with dark side energy, Yoda is able to stay outside of the Empire's reach. After Luke Skywalker is urged by Obi-Wan Kenobi to seek out Yoda's tutelage, he lands on Dagobah but is disappointed with what he finds: a peculiar, little green creature. After Yoda expresses doubt about Skywalker's patience and temperament, only then does the farm-boy realize his small companion's true identity.