When Willie finds a map from one of his dead relatives, he and ALF trek to Death Valley to try and find a possible treasure. Things don't go as planned when ALF drinks all the water beforehand and then gets too hot from the sun.
When ALF finds out that a local corporation is using CFCs that pollute the environment, he writes several letters of protest, all under fake names. When the corporation threatens with legal action, Willie goes over to meet with them only to have them try to buy his silence by offering him a high-paying job.
Fearing that he might "internally blow up" due to his high calorie consumption, ALF decides to cut meat from his diet. However after a few days, ALF turns into a "wolf" and steals the Tanner's car in an effort to hunt for food.
When ALF picks up a signal on the Tanner's radio, he realizes that it is someone trying to get in touch with him through Melmacian code. He cracks the codes and finds that it's two of his friends who want to pick him and take him to their new planet. He agrees to meet them unaware that the Alien Task Force is onto them.