Grem and Acer are the two tertiary antagonists of Cars 2. Grem is voiced by Joe Mantegna and Acer is voiced by Peter Jacobson.
Grem is a dented, rusty orange AMC Gremlin. After years of being dismissed for his design, even being called a "lemon," Grem has a big chip on his fender that has led him to the underworld of international espionage.
As a henchman for a villainous boss Professor Z, Grem and his partner-in-crime Acer are trying to sabotage the World Grand Prix and the famous race cars competing in it. When Grem and Acer mistake Mater for an american agent with important top-secret information, the ruthless lemons set out on a-round the globe to stop Mater from foiling their evil scheme.
Acer has always felt like an outcast in the car world. The beat-up green AMC Pacer joined forces with fellow "lemon" cars as henchman for the devious Professor Z, whose clandestine mission is to wreck havoc at the highly visible World Grand Prix.
Acer must hunt down the American and British secret agents who've stolen crucial information about Professor Z's unhanded plot