The Doctor and Jamie are forced to abandon the TARDIS when the mercury fluid link explodes, finding themselves aboard a spacecraft called the Silver Carrier.
The Doctor and Jamie are rescued and taken aboard the Wheel space station. Jamie sabotages the Wheel's laser to save the TARDIS from destruction but places everyone in danger.
Cybermats are sent to the Wheel to eat the stations supply of bernalium, forcing the Wheel to search for bernalium on the Silver Carrier where the Cybermen are waiting for them.
The station is in danger of being destroyed by the approaching meteor storm. The Cybermen are smuggled aboard the Wheel and begin to take control of the crew.
The Cybermen reveal their plans to invade Earth, using the Wheel as a guiding beacon. The Doctor sends Jamie and Zoe on a dangerous spacewalk to the Silver Carrier.
The Doctor and the crew of the Wheel battle against the invading Cybermen, but to defeat the approaching fleet of Cyber ships, the Doctor needs a component from the TARDIS. Show more