|“||The next time he makes a stop, instead of saying 'ka-chow', he's gonna go 'ka-boom'!||”|
–Acer mocks Mater about Lightning McQueen
He was voiced by Peter Jacobson.
Acer first appeared on the oil platform as one of the Lemons, who thought they had killed Finn McMissile. He was next seen in Japan when he along with Grem attacked Rod Torque Redline in the bathroom. Rod then managed to pass along a device containing information to Mater (who happened to be there) regarding the conspiracy plot.
Afterward, as Grem tested the electromagnetic pulse camera that would be used to blow out the race cars' engines during the World Grand Prix on Rod, Acer interrogated him to find out which of the cars Rod spoke to had the device. When he showed a picture of Mater, Professor Z noticed the look in Rod's eyes and discovered Mater was the one and had him killed. Acer was assigned to help Grem use the camera on the race cars during the World Grand Prix. He aimed the camera beam at racers and with the result of the Allinol heating up, blew out their engines. Grem and Acer also caused a big crash in Italy. After Mater, Finn, and Holley tried to stop the lemons, they were all captured. Grem and Acer were then assigned to kill McQueen using the camera but since Sarge and Fillmore switched out the Allinol with Fillmore's organic biofuel mixture, the camera beam did not work properly.
When Mater discovered the bomb strapped to his radiator and McQueen chased Mater down to see what the situation was, Acer along with Grem pursued them throughout London until Holley Shiftwell intervened and threw Grem and Acer off the road and into the Ye Left Turn Inn restaurant where they are last seen being beaten up by an angry cars bigger and stronger than them. It is completely unknown what happened to Acer and Grem afterwards, but it is likely that in case they were not beaten to death by the car clients (as they were just angry albeit most probably without murderous intentions), they were later taken into custody with the other Lemons.
- Acer is so far the only animated character to be voiced by Peter Jacobson.
- Acer's name is Pacer without the p.