(Doctor Who, Back to the Future)
Christopher Salmon created this animatic of Neil Gaiman's short story in an attempt to convince Gaiman to allow him to create an animated film version of the story. It worked. The fully-animated version is currently in production.
(E.T. the Extra-Terrestrial)
Why couldn't the actual "Legend of Zelda" cartoon be more like this?
Get Over Here and Play a Video Game