It was not until the final season of the Alvin revival (nearly two decades after creator Bagdasarian’s death) that Theodore, Simon and Alvin had a series of movie take-offs including Dianne Dixon’s episode, “Back to Our Future,” in which the quirky inventor Clyde Crashcup (filling in for Doc Brown) brings the 90s trio back to the 50s to stop the original trio from giving up their singing careers.