Dark Spirit

The Dark Spirit was a manifestation of the dark side on the planet Dagobah. It dwelled within the Dark Side Cave.

History
As part of his training, Yoda sent Luke Skywalker against the spirit, which took the form of the Sith Lord Darth Vader for the fight. After a short duel, Luke defeated the spirit, severing its head and unmasking it.

When he looked to the unmasked head, he saw his own face behind the mask, and realized that although this construct had been defeated, he still has much training to do to confront the real Vader.

Behind the scenes
In the game Lego Star Wars II: The Original Trilogy, the duel with the Dark Spirit is very different for gameplay reasons. Yoda takes part in the duel and it goes on for much longer.

Appearances

 * Star Wars Episode V: The Empire Strikes Back
 * Lego Star Wars II: The Original Trilogy
 * Lego Star Wars: The Complete Saga