Three years after the destruction of the Death Star - the Rebel Alliance continues the fight against the Imperial forces and suffers a defeat on the ice planet Hoth. Luke Skywalker journeys to the planet Dagobah to train with Jedi Master Yoda - who has lived in hiding since the fall of the Republic. In an attempt to convert Luke to the dark side - the evil Sith Lord - Darth Vader - lures Luke into a trap in the Cloud City of Bespin. In the midst of a fierce lightsaber duel with Vader - Luke faces the startling revelation that the Sith lord is in fact his father - Anakin Skywalker.
Developed for service aboard capital warships and battle stations - these droids look much like R2 units except for their clear plastex domes that show off their computer processors.