Mack

Mack is a character on Cars and its 2011 sequel. He is Lightning McQueen's chauffeur and is presumably considered his only friend at the start of the first film. 
== Cars and Humans ==
Mack is responsible for transporting Lightning McQueen to all his races. After McQueen pushes him to drive all night to California, Mack falls asleep and ends up losing McQueen. He is seen on television as he arrives in California and discovers that McQueen is missing. At the final race, he was to act as McQueen's pit crew before the Radiator Springs folks came. During the credits, he watches parodies of other Pixar movies and notes that all of them feature a character played by John Ratzenberger, and amusingly, he is voiced by Ratzenberger as well.
Additional information is that he meets Emma, and congratulates her on her singing voice.