Muk & Luk are the two polar bears who usually like to play pranks on Boris, they serve as the tetartagonists of the first film. They are presumably brothers. Muk only talks whilst Luk only makes noises. Most about Muk and Luk's origin is unknown. Muk and Luk live in the forests of Alaska. They are often seen visiting Boris and Balto. They are both voiced by Phil Collins in the first film and Kevin Schon in the sequels.