A contributing factor was exhaustion attributable to their busy schedule of writing, recording and touring. Afterwards they were hesitant to begin another film project, and "Help!" was their last full-length scripted theatrical film. The Beatles saw the 1968 animated film "Yellow Submarine" (in which their characters were voiced by actors, and they themselves made only a token appearance) as a favourable way to complete their commitment to United Artists for a third film. Many fans have assumed that the cartoon did not satisfy the contract, but "Let It Be" (1970) was the film not connected to the original three-picture deal.