The boys stage a chariot race through the town's streets after learning about ancient Greece. Meanwhile, Dr. Doofenshmritz creates a giant robot named Norm to destroy Perry, once and for all.

The boys build a roller-derby rink for their grandma, who once was on a championship derby team, so she can skate against her onetime rival. Meanwhile, Doofenshmirtz believes a statue of a bearded man is mocking him because he can't grow facial hair, leading him to create a machine to solve his problem for him.