In Pixar's Cars (2006), the tow truck Mater becomes Lightning McQueen's closest friend in Radiator Springs.
Mater is a rusty, enthusiastic tow truck who lives in the town and quickly takes an interest in the newcomer. He introduces McQueen to local customs, residents, and activities, including tractor tipping. His open, humorous personality contrasts with McQueen's initial self-importance.
Mater's friendship is important because McQueen begins the film surrounded by racing attention but lacking genuine personal connections. Mater treats him as a friend before McQueen has earned fame or success, helping the race car see the value of loyalty and community.
The character is voiced by Larry the Cable Guy in the English-language films. Mater returns in Cars 2 as a major character and becomes involved in an international spy adventure. That sequel expands his role, but the friendship between Mater and McQueen begins with their meeting in Radiator Springs.