The art work for Fireman Sam: Alien Alert has been released.

Fireman Sam: Alien Alert will debut in 2017 and sees David Tennant voice the villain, alien-hunter cum TV presenter Buck Douglas.

The special one hour feature sees Pontypandy hit by a raft of UFO sightings, with Fireman Sam determined to get to the bottom of the mysterious events.

“Alien Alert is an action-packed Fireman Sam adventure for pre-schoolers, and we’re delighted to have the talented David Tennant on board as the voice of Buck," said Christopher Keenan, senior vice president, global content and executive producer at Mattel Creations.

"The special stays true to core Fireman Sam values - bravery, loyalty, heroism, community and teamwork - but takes us to new levels of excitement with a sci-fi slant that includes new characters, rescue vehicles, locations, and plot twists. Producing Alien Alert has been an incredible joy and we're confident that our young audience will be captivated by our most dramatic Fireman Sam story yet.”

Fireman Sam: Alien Alert is distributed worldwide by DHX Media.