Sheridan Smith and Gemma Chan are among the list of guest voices for the final episodes of season three of Thunderbirds Are Go, airing in January.

2020 will see more big-name screen and TV personalities join the Thunderbirds Are Go team as guest voices for the final episodes of season three, due to air on ITV & CITV from January. Thunderbirds Are Go has added Sheridan Smith OBE and Gemma Chan to its voiceover wall of fame, as well as Peter Davison, Tanya Moodie, Cel Spellman and Sacha Dhawan.

They all join series regulars Thomas Brodie-Sangster, Rasmus Hardiker, and David Menkin, who play the Tracy brothers, as well as Angel Coulby as Kayo Kyrano, Kayvan Novak as Brains, Sandra Dickinson as Grandma Tracy, Rosamund Pike as Lady Penelope, and David Graham, now entering his sixth decade as the voice of Parker.

Sheridan Smith is Scraps, a fearless urban explorer and junk collector who scavenges for valuable treasure in deep underground trash mines. Gemma Chan lends her voice to Professor Kwark, an aeronaut who has designed the latest high-speed jet attempting to break the world air speed record.

Peter Davison voices Higgins, a long-time employee of Brains’ close friend Professor Moffatt. Tanya Moodie is Chief Carter, a fire chief who needs assistance from International Rescue in tackling an outbreak of fires.

Cel Spellman is The Announcer, who lends his enthusiastic commentary to an attempt by aeronaut Professor Kwark to break the world air speed record. Sacha Dhawan voices Stew, a sailor out on his first sea voyage whose tanker’s engines break as a tsunami heads directly for it.

In these all-new, action-packed episodes of Thunderbirds Are Go, the Tracy Brothers will embark on their most personal rescue mission yet, to find their missing father, following the news that he may still be alive.

Thunderbirds Are Go will air on ITV & CITV, every Saturday at 8:30am from 4th January 2020.