The Simpsons family sits on the couch for the opening credits.

The family discovers they've been robbed while Homer slept.

The Simpsons discover their stolen items and receive a mocking phone call from Nelson.

Chief Wiggum and Lou map the burglaries, creating an arrow pointing at the police station, causing them to panic.

Kent Brockman suggests the burglar could be a monster, and the police tracking dog attacks an officer.

A salesman demonstrates a ridiculous security house.

Homer tries to cheer up Lisa after her saxophone is stolen.

Ned Flanders calls a neighborhood meeting and nominates Homer as leader of a vigilante group.

The group assigns code names and accidentally fires guns.

Homer leads the group in destroying a beatnik museum exhibit.

Homer's group harasses citizens and chases a saxophone player.

Homer justifies his actions while Lisa questions him.

The cat burglar calls a TV show, taunts Homer, and announces his next crime.

Homer tries to guard the museum but gets distracted by underage drinking.

The vigilante group kicks Homer out after he fails.

Abe Simpson reveals that Malloy from the retirement home is the cat burglar.

Abe Simpson explains how he deduced Malloy is the burglar.

Malloy admits to the burglaries and praises Homer for catching him.

Malloy returns all stolen items and charms the crowd before being arrested.

Malloy claims his loot is buried under a big T in Springfield, causing a frenzy.

Malloy gives fake directions, causing the town to dig a huge hole and panic.

The townspeople find only a note from Malloy.

The episode ends with credits and a shushing sound.