Animatrix is 9 episodes ~10 minutes long that relates one way or another to the Matrix.
One of the episodes (I think A Kid's Story), is the story of a teenager being taken out of the matrix with Neo's help. This teenager is the same as the one in Matrix:Reloaded that's always following Neo around in Xion (can't remember his name).
The 1st 3 episodes are absolutely amazing. The others are also pretty good, but one or 2 blow big time. Definitely worth buying the DVD. I'm not going to give more details so you have a chance to see Animatrix.