Agent Z and the Penguin from Mars is a 1996 Children's BBC sitcom, based on the book of the same name by Mark Haddon.

Following the arrival of an unpleasant and dull new astronomer neighbour Dennis Sidebottom, a supposed lottery winner, the gang plot their biggest ever practical joke: an elaborate conspiracy involving a penguin stolen from a supermarket Christmas display, an alien from Mars, a spaceship and a "message for mankind" carved on a meteorite.

The series also included a number of subplots, such as Ben's infatuation with Sidebottom's pianist daughter, Samantha, and the thieving activities of the Sidebottom's disturbing son, Tod – on one occasion he is caught shoplifting a large quantity of Dolly Parton albums.

It was also notable for its realisations of Ben's fevered imagination, which led to extravagant dream sequences, such as a recurring image of him as a millionaire, complete with a well-spoken butler called Finlay, and another featuring Sidebottom as a vampire.

[1] Although well received it has not been repeated, nor released to DVD, despite the renewed interest in the work of Mark Haddon following the publication of The Curious Incident of the Dog in the Night-Time.