This is a list of all the Imaginationland episode, movies, shorts and specials that ever came out.
Imaginationland 3 part story arc
Imaginationland Episode I (Airdate: October 17, 2007)
Imaginationland Episode II (Airdate: October 24, 2007)
Imaginationland Episode III (Airdate October 31, 2007)
Imaginationland 2 (Release date: May 19, 2017)