The group is set upon by a pack of aggressive dogs led by Alpha, a doberman (who is also seeking the bird), and are taken to their master, who turns out to be an elderly Charles Muntz. Muntz invites Carl and Russell aboard his dirigible, where he explains that he has spent years since his disgrace searching for the giant bird. When Russell notes the bird's similarity to Kevin, Muntz becomes hostile, believing they have been attempting to steal the bird. The pair flees with Kevin and Dug, but Muntz catches up with them, captures Kevin and starts a fire beneath Carl's house, forcing him to choose between saving it or Kevin. Carl rushes to put out the fire, allowing Muntz to take the bird. He and Russell eventually reach the falls, though Russell is disappointed in Carl over his decision to abandon Kevin.