When a cat burglar steals Alvin's skateboard, he decides he wants to join Dave's neighborhood watch. After The Chipmunks fail to capture the man the first time they see him, Alvin proclaims they must equip themselves and start their own watch. While Theodore buys costumes, Alvin and Simon modify their bikes. The boys go out patrolling in their bunny suits looking for criminals but mistake a couple of men as such instead. They finally see the burglar riding a skateboard and pursue, soon Dave is after them too. Thanks to a handy modification to Alvin's bike by Simon, they catch the man.
- The title is a pun on the saying "Guardian Angels."
- "The 'C' Team" is first performed in the episode The C-Team and once again in Robomunk.