When a strange message pod turns up at Unit HQ, the Doctor and his assistant Jo suddenly find themselves involved in another dangerous mission for the Time Lords. The Tardis takes them to Skybase One above the inhospitable Solos. It is the 30th century and the planet is about to gain independence from Earth’s glorious empire. But someone on Solos has other plans and, alarmingly, the natives are slowly mutating into fierce-looking creatures. It’s time for the Doctor and Jo to find out why...

Special Features:

• Commentary by Katy Manning (Jo Grant) and Garrick Hagon (Ky), Christopher Barry (director), Terrance Dicks (script editor), Bob Baker (co-writer), Brian Hodgson (special sounds supervisor) and Jeremy Bear (designer), Moderated by Nicholas Pegg.
• Mutt Mad Cast and crew look back at the making of the story 
• Race Against - Time Noel Clarke narrates a documentary looking at the representation of non-white actors in Doctor Who and on British TV as a whole 
• Blue Peter Peter Purves looks at a collection of Doctor Who monsters 
• Dressing Doctor Who 
• Radio Times Billings (PDF DVD-ROM –PC/Mac) 
• Programme Subtitles 
• Production Information Subtitles
• Photo Gallery
• Coming Soon Trailer 
• Digitally remastered picture and sound quality