This was documented in JW Rinzler's 2010 book "The Making of Star Wars: The Empire Strikes Back", which includes a picture of the monkey, wearing a mask with his trainer One of the main reasons ...

LOS ANGELES -- "I am your father." Those four words from Darth Vader are the most well-known in "Star Wars: The Empire Strikes Back" and possibly the entire galaxy! "The Empire Strikes Back" turns ...