The Star Wars: A New Hope back in 1977, and is one of the few characters that appeared in all films from the Skywalker saga.
As the Luke that Darth Vader was his father, as he actually knew Anakin Skywalker and witnessed his turn to the dark side.
This question hasn’t been addressed by George Lucas, and Mark Hamill doesn’t have an answer either, but what if R2-D2 didn’t know the real identity of Darth Vader?
Star Wars Theory: R2-D2 Didn’t Know Anakin Skywalker Became Darth Vader
R2-D2 served Queen Amidala and later Anakin Skywalker, accompanied by C-3PO. Unlike the golden protocol droid, R2-D2 never had a full memory wipe, so he was well aware of all events that happened around him. At the end of A New Hope begins, but R2-D2’s memories remained intact, which is why many fans wonder why he didn’t tell Luke the truth about his family history, but he might have not done that because he didn’t even know about it.
Though R2-D2 was by Anakin’s side through his transformation from Jedi to Sith and accompanied him to Obi-Wan thought Anakin was dead. R2-D2 was present when Pé gave birth to Leia and Luke, so he knew Luke was Anakin’s son – but what he didn’t know was that Anakin became Darth Vader. In addition to that, Anakin’s fall was surely a painful event in R2-D2’s life, one that he definitely wouldn’t like to or even talk about. Whether R2-D2 truly wasn’t aware of Anakin’s survival and transformation or he just chose not to talk about it again is something that will remain a mystery in the Star Wars universe until Lucas decides to offer a proper explanation.
