The Chase

Using the new visualiser the Doctor can see events during any time period. Using the device the Doctor notices that the Daleks have their own time machine and are pursuing the TARDIS.

The Doctor tries to escape from the Daleks by materialising in a number of locations in different time periods. The TARDIS is unable to take off immediately from any location as the Doctor has to work out the co-ordinates for the next location, which allows the Daleks to close in.

Eventually, on the planet Mechanus, the Daleks do catch up to the TARDIS. The Daleks attempt to use a robot lookalike of the Doctor to infiltrate the Doctor's compaions. The Doctor and his companions are kidnapped by the Mechanoids, where they are put in a cell with Steven Taylor.

A fierce battle erupts between the Daleks and the Mechanoids causing the mutual annihilation of each. The Doctor then uses the Daleks' time machine to return Ian and Barbara to the twentieth century, two years after they left. Steven, his spacecraft having crashed, joins the Doctor and Vicki in the TARDIS.

• Dalek Voices: David Graham, Peter Hawkins;
• Daleks: Robert Jewell, Kevin Manser, John Scott Martin (1-4), Gerald Taylor;
• Abraham Lincoln: Robert Marsden (1);
• Francis Bacon: Roger Hammond (1);
• Queen Elizabeth I: Vivienne Bennet (1);
• William Shakespeare: Hugh Walters (1);
• Television Announcer: Richard Coe (1);
• Mire Beast: Jack Pitt (1,2);
• Malsan: Ian Thompson (2);
• Rynian: Hywel Bennett (2);
• Prondyn: Al Raymond (2);
• Aridian: Brian Proudfoot (2);
• Guide: Anne Gordon (3);
• Morton Dill: Peter Purves (3);
• Albert C. Richardson: Dennis Chinnery (3);
• Captain Benjamin Briggs: David Blake Kelly (3);
• Bosun: Patrick Carter (3);
• Willoughby: Douglas Ditta (3);
• Cabin Steward: Jack Pitt (3);
• Frankenstein's Monster: John Maxim (4);
• Count Dracula: Malcolm Rogers (4);
• Grey Lady: Rosyln de Winter (4);
• Robot Doctor Who: Edmund Warwick (5);
• Mechanoids: Murphy Grumbar (5-6), Jack Pitt (6), John Scott Martin (6);
• Mechanoid Voice: David Graham (5-6);
• Fungoids: Jack Pitt (5), John Scott Martin (5), Ken Tyllsum (5-6);


• UNCREDITED CAST:
• Double for Ian: David Newman (2);
• Double for Vicki: Barbara Joss (2);
• Tourists: (all 3) Barbara Bruce, Kathleen Heath, Marc Lawrence, Terry Leigh, Monique Lewis, David Pelton, Bill Richards, Sean Ryan, Sally Sutherland, Jim Tyson;
• Stuntmen: (all 3) David Connon, Marilyn Gothard, Fred Haggerty, Gerry Wain; Bus Conductor: Derek Ware (6);