CONTROL Agent Esperanza manages to get The Tequilla Mockingbird away from KAOS, but she's killed before she can reveal its location. Max and 99 are sent to Mira Loma, Mexico to find it and keep it out of KAOS' clutches. Max poses as a bad doctor and 99 as a dancer and singer to infiltrate the town. They run into Valdez and Dietrich, who are looking for the mockingbird as well.

This is a mild spoof of The Maltese Falcon, with Dietrich playing Sidney Greenstreet's character.

The showdown at the end is a spoof of The Good, The Bad, and The Ugly, one of Clint Eastwood's biggest movies.

The title also refers to the classic movie To Kill A Mockingbird.