TV Guide BBC Three Friday

Jeremy Clarkson, James May and Richard Hammond compete in a land race from Resolute, Canada, to the North Pole in their most ambitious challenge to date. Pitting horse power against dog power they travel 450 miles across mountainous land masses and jagged sea ice at temperatures as low as minus 65C

When Ray - Paul's old archery teammate and Rachel's ex-boyfriend - sends his annual card teasing Paul for failing to win a medal at the Athens Olympics in 2004, Amy, Sam and Maya start watching some of Paul's old archery videos to learn more about him. Convinced that Ray cheated Paul out of a place on the team in Beijing by sneezing just as he was about to fire a crucial shot in qualifying, the kids put pressure on Paul to confront Ray in Cardigan when Amy is due to stay with Maya in Swansea. However, the visit to Ray's house takes an unexpected turn when Paul learns more about Rachel and Ray's old relationship and Amy discovers that Maya is otherwise engaged. Comedy, starring Jim Howick and Alison Steadman

Cherry introduces Gemma and Sadie to Rocky's Rhyme Time, the hottest ticket in town for young mums. Gemma isn't convinced that leader Rocky is everything Cherry says he is, and the pair fall out. Gemma tries to make amends, and in doing so, makes an interesting discovery about Rocky. Meanwhile, Jackie takes Malcolm and Derek on a day trip to the Peak District. Comedy, starring Aimee Lou Wood, David Morrissey, Jill Halfpenny and Sarah Hadland

The finale finds the teams racing from Medellín, Colombia's second-largest city, in an epic push of over 1,000km to the finish line on the Guajira peninsula, the northernmost region of South America. They can either cut a course inland or follow the tourist trail along the Caribbean coast. After 33 days and nearly 5,900km, it still remains to be seen which team will triumph, be first to sign the all-important book and be crowned the winners. Narrated by John Hannah

Amber Haque explores the relationship between the Friends actor and Los Angeles-based drug dealer and dual US-UK citizen Jasveen Sangha - dubbed the Ketamine Queen by US prosecutors - who was one of five people charged in connection with Perry's untimely death, including two doctors and Perry's personal assistant. She pleaded guilty to five federal counts, including one of distributing ketamine resulting in death