The Invasion (Television Story)

Plot
The Cybermen have immobilised the Earth's population with a hypnotic signal. Their fleet arrives and they invade in force. The Doctor desperately attempts to persuade Vaughn to help him resist the invaders.
Part 1
Part 2
Part 3
== Cast ==
The Doctor- Robert Lacey
Professor Edward Travers
Professor Watkins
Isobel Watkins
Tobias Vaughn 
Brigadier Lethbridge-Stewart - Pat Harrington Jr.
John Benton - Gary Lockwood
Packer & Cybermen Voice - Marvin Miller
== Production ==
2001: A Space Odyssey’s Gary Lockwood was cast in the role of John Benton. Gary eventually returned to the role to the role during the completion of The Third Doctor’s era as fans really grew to like Gary Lockwood’s portrayal.