Conversation so far:
When did Darth Vader turn to the dark side
The moniker is bestowed upon Anakin in Revenge of the Sith upon his turn to the dark side of the Force.
Does Darth Vader return back from the dark side
Darth Vader, ultimately escapes the dark side and redeems himself by sacrificing his life to save his son, Luke Skywalker, and kill the Emperor in Return of the Jedi.

Question: How many episodes does the character appear in
Self-contained rewrite: In how many episodes of Star Wars does Darth Vader appear in