- Jodie Whittaker (The Doctor)
- Mandip Gill (Yasmin 'Yaz' Khan)
- John Bishop (Dan Lewis)
Episode: Planet of the Ood
Air Date: 2008-04-19
Runtime: 46 min
The Doctor and Donna find themselves on an icy planet known as the Ood-Sphere. There they discover what drove the Ood to be a servant race.