Force Ghost

Force ghosts are the descendance of the force of a jedi following his death. 4 jedi are known to have used this technique and these are Qui-Gon Jinn, whose ghost are not known to have reached physical form or not, Yoda, Obi-Wan Kenobi and Anakin Skywalker. There's a strong possibility that Luke Skywalker also have learned this technique as he have had contact with previous mentioned force ghosts.

Appearances

 * Star Wars: Episode II Attack of the Clones
 * Star Wars: Episode IV A New Hope
 * Star Wars: Episode V The Empire Strikes Back
 * Star Wars: Episode VI Return of the Jedi
 * Star Wars: Episode VII The Force Awakens