After the events of the game Plants vs. Zombies where the player defeated Dr. Zomboss at the rooftop of the house, zombies once again attacked the front yard and after the zombies are all defeated, the player gets the hot sauce and gave it to Crazy Dave. Crazy Dave ate his taco, and wanting to eat the taco again, he wants to time-travel and the player is introduced to his partner, Penny, a supercar that can time travel. Unfortunately, they went back to Ancient Egypt, revealing that they time traveled 4500 years into the past. And the journey goes on!