Investigating the disappearance of an eminent scientist, the Doctor and his companions follow his trail to the London headquarters of International Electromatics, a global supplier of electronic equipment run by the formidable Tobias Vaughan. Teaming up with the newly-formed Unit Nations Intelligence Taskforce - UNIT - under the command of Brigadier Lethbridge-Stewart, it soon becomes apparent that Vaughan is working to his own sinister agenda. As Cybermen invade in cities all over the world, can the Doctor convince Vaughan to help him defeat their plan for global domination.

    -- from the DVD release, 2006

An experimental release on both VHS and DVD formats, as in both cases it represented the first example of an incomplete story appearing with specially recorded links. For the 1993 VHS, Nicholas Courtney was called in to record to-camera explanations, and for the 2006 DVD 2entertain purchased the rights to use an animation made the previous year by Cosgrove Hall for the BBC's Interactive Drama & Entertainment.

Episode timings on DVD: 23'43", 24'28", 23'45", 23'06", 23'27", 23'21", 24'45", 23'59"
Episode timings on PasB: 23'42", 24'26", 23'44", 24'18", 24'25", 23'20", 24'46", 25'05"

Flash Frames (11'30")
James Goss, Steve Maher and Claire Grey discuss how Scream of the Shalka came about, why the animation was restricted and how much more freedom they had with The Invasion.
Jon Doyle discusses the history of Cogrove Hall, Maher the unusual nature of working to a fully mixed soundtrack and the other sources they used and Goss how the concept of providing an animation came about.
Frazer Hines mentions how great the original designs were, and Doyle and Grey how helpful it was that the episodes were b/w.
Maher and Grey cover the animation process and Doyle enthuses about working "with" Pat Troughton and how he came to double for the Doctor.
Filmed and Directed by Cat Chappell, Geoff Evans, Hannah Wiliams
Editor: Keith Farmer
Producer: James Goss
(C) 2006 2entertain

Love Off-Air (15'16")
David Holman, Justin Richards, Gary Russell, Mark Ayres and Michael Stevens share their memories of recording Doctor Who in the 60s and 70s - how they did it, why, the problems they faced and the excitement they gained from being able to listen back to the old ones. Mark Ayres' restorations are also under discussion, particularly his work on The Invasion.
With thanks to Mark Ayres, David Holman, Justin Richards, Gary Russell, Michael Stevens and anyone else who ever held a microphone quite near the television.
Camera: Steve Bailey
Online Editor: Ed Stradling
Producers: Rob Francis, James Goss
(C) 2006 2entertain

Animation Trailers (1'06")
Two trailers put together by Cosgrove Hall as part of their pitch to the BBC, featuring animated versions of clips from existing episodes.

Character Design (2'49")
The unused animated version of the Troughton titles followed by a montage of still images and simple animations of all the main characters.
Character Design by Steve Maher
(c) 2006 2entertain

Evolution of The Invasion (50'24")

• Wendy y Padbury and Frazer Hines recall Patrick Troughton being a reclusive figure and Terrance Dicks explains why Troughton chose to leave the show (Hines wonders if they'd still be there today), the script turnaround problems and what the producers had hoped to acheive with The Invasion - Hines recalls location shooting with glee.
• Dicks, Chris D'oyly-John, Hines, Nicholas Courtney, Padbury, Kevin Stoney and Sally Faulkner share their memories of Douglas Camfield as a hard taskmaster, a wonderful cameraman and someone who got the best out of everyone.
• UNIT comes under discussion with Dicks explaining the concept and Courtney his character (Hines shares his excitement at having Nick back on the show).
• Moving onto The Invasion itself, Dicks talks about Kit Pedlar's desire to be seen as creative rather than scientific and Hines about how terrifying the Cybermen were - Padbury enthuses about how wonderful the audience were in working with them on this.
• Courtney, Hines, D'oyly-Jones, Stoney and Padbury move back to Troughton and what a joy he was to work with, finally getting the acting recognition he deserved. Peter Halliday admits Troughton was his favourite Doctor.
• Wendy Padbury on talking a computer into exploding and Faulkner on Isobel. They both discuss the characters' relationships. And miniskirts.
• Ian Fairbairn explains his character's motivations while Edward Burnham and Courtney talk about the Watkins character, a cost-saving replacement for Professor Travers. Peter
• Halliday talks further about Packer, with comments on his sadness by Padbury and his bad luck by Hines.
• Padbury describes Stoney as "sensational" and explains his quality helped raised everyone's game - Stoney modestly attributes it to the script. Dicks and Courtney enthuse about how effortlessly evil he was.
• D'oyly-John then talks about the problems the Cybercostumes created for the actors and what his job on the show was.
• As the documentary moves on to cover the filming, D'oyly-John remembers the difficulties of helicopter filming, Hines the fear that the pilot put in him and Faulkner her natural fear of heights. D'oyly-John then explains why St Paul's was chosen, Hines how quiet London was while shooting and Faulkner how epic the scene was. Hines and D'oyly-John tell us the obvious bonuses... and drawbacks... of filming at the Guiness factory and Stoney on the pyrotechnics he had to contend with during his final scene.
• Courtney recalls undergoing soldier training and Hines defacing the set.
• Moving onto the studio taping, Stoney recalls the quick turnaround, Halliday and Hines on playing around between scenes and Faulkner forgetting her lines in front of the producers.
• Fairbairn explains why Vaughn had two identical offices and Faulkner recalls some nice photos of her having been stolen, forcing them to be replaced by ones of Sheila Dunn.
• Hines and D'oyly-John talk about the rare recording breaks, using Vaughn being shot as an example.
• A scene deleted from the final script is recreated in photographic for and Fairbairn discusses his death scene. Stoney and Courtney explain how the rehearsal and recording process occured.
• Harper's music comes under analysis and Dicks offers his final thoughts on the script. Hines describes The Invasion as "one of the best" and Dicks looks at the legacy The Invasion left them with...

Narrator: Frazer Hines
Interviewer: Andrew Beech
Photographic Research: Derek Handley, Ralph Montagu
Consultant: Andrew Pixley
Illustrations: Rob Hammond
Thanks to John Sheen, Richard Bignell
Music: Don Harper, Brian Hogdson
Colourist: Jonathan Wood
Produced & Directed by John Kelly
(C) 2006 2Entertain

1993 VHS Links (2'58")
The original links produced by John-Nathan Turner and featuring Nicholas Courtney as used on the 1993 video release.

Photo Gallery (7'22")
97 colour and b/w photos from the making of the story, and six colour photos from the commentary recording.
With thanks to BBC Photograph Library, Bill Chesneau, Sally Faulkner, Derek Handley
(C) 2006 2entertain

Commentary
By James Goss, Mark Ayres and Steve Maher on Parts One and Four, recorded on Ayres' laptop in a conference room at BBC's Media Centre, White City.
By Wendy Padbury, Frazer Hines, Nicholas Courtney and Chris D'Oyly-John on the remaining episodes (with some comments from the actors on Part Four) recorded in Dubbing Theatre 3 at TVC. 

Information Text
By Martin Wiggins