Luthor the Doberman, a former attack dog, has a good home with Savannah Drysdale, but every time a certain truck passes he goes into a frenzy, while Griffin Bing is caught up in trying to beat his rival, Darren Vader, at an invention contest.

When Justin Zeckendorf is teamed up with two of the smartest girls in his fourth grade class for a good deed contest, his zany ideas almost cost them their chance to win.