""featured Dagobah in a sixth-season episode, in which Yoda traveled to the planet as part of his own training to gain immortality through the Force.In the "Star Wars" expanded universe, Yoda confronted a Bpfasshi Dark Jedi on Dagobah, some years before the events in "The Empire Strikes Back", and the cave where the Dark Jedi died became strong in the dark side of the Force.