G.I. Joe: The Movie  also known as Action Force: The Movie 1987

While Cobra Commander  and  Serpentor  blame each other's stewardship of Cobra as the root cause of the organization's failures, Pythona, a woman from the secret civilization Cobra-La, infiltrates the Terror Drome. While there, she reveals to Serpentor that Cobra-La was responsible for inspiring Doctor Mindbender to create Serpentor through dream manipulation. At her urging, Serpentor plans to capture G.I. Joe's latest weapon, the Broadcast Energy Transmitter (BET).