Cartoon Network became more involved in the designs of the aliens than the company was for Ben 10. The company along with Boomerang, suggested to the filmmakers that combining aliens be the main draw for the movie.
During development, there is going to be 3h 30m in the movie, rather than 1h 30m where some unused aliens are going to be used in the early film. However in the final film. The running time 3h 30m was reduced to 1h 30m for unknown reasons, which 1h 30m was not present in the early film. 153554b96e