The Incredible Hulk S01E06 - Man to Man, Beast to Beast

Bruce Banner travels north into Canada in an effort to track down Walter Langkowski a scientist who specializes in gamma radiation. After falling into a frozen lake he transforms into the Hulk and goes into town. He is mistaken for the Sasquatch and is chased away. After the Hulk passes out in the woods, Bruce Banner is rescued by Langkowski. Banner later discovered that Langkowski has been experimenting on himself. He has turned himself into the Sasquatch who attacks Banner for knowing his secret. Banner manages to calm the Sasquatch. He and Langkowski run an experiment to cure themselves. When a boy interferes with the experiment Banner transforms to save him. Sasquatch now transformed permanently attacks the Hulk and the two monsters fight. The boy interferes and is injured. The Sasquatch realizes this and decides to leave. Men from the town appear and let the Hulk leave when they realize he was protecting the boy.