Darth Gandalf was basically the most mazing wizard ever, but he was no match for the amazing sith ever to have lived. We do not know who defeated Darth Gandalf, but I'm sure he died valliantly. Darth Gandalf weilded a purple lightsaber, because purple is the colour of rainbows.
Darth Gandalf had an annoyying habit of yelling phrases like 'YOU SHALL NOT PASS,' and then consequently being pulled down a hole by a whip. He also had a strange obsession with dwarves, and so became extremelly crazy when Yoda was born. Darth Gandalf had different coloured robes and fake beards for every day of the week, ranging from grey, to red, to white, to purple. He spent his time off playing Lord of the Rings Online as Legolas.
Darth Gandalf was once a Jedi, like everyone else, but turned Sith because he didn't like the cafeteria food. He took only one apprentice, but he only lasted .09 millisconds before being dstroyed by Gandalf's awesomeness.