From the DVD - 25th anniversary ed.
Special features: (Disc 1) Audio commentary by Carole Ann Ford (Susan), Nicholas Courtney (the Brigadier), Elisabeth Sladen (Sarah Jane) and Mark Strickson (Turlough) ; Celebration: a look back at Doctor Who's 20th anniversary celebration in 1983 (52 min.) ; Trails and continuities (19 min.) ; Photo gallery (8 min.) ; Special hidden feature
(Disc 2) Audio commentary by Peter Davison (the Doctor) and writer Terrance Dicks
"The ties that bind us": documentary examining the links to the show's past and future in "The Five Doctors" (26 min.) ; "Five Doctors, One Studio": a studio recording of the only occasion when all the Doctors were together on set (18 min.) ; Outtakes (6 min.) ; "(Not so) Special effects": a look at a typical day's work for the visual FX crew on Doctor Who (9 min.) ; Publicity clips from "Saturday Superstore, " "Blue Peter, " Nationwide" and "Breakfast time" (29 min.) ; Easter egg ; Isolated music track on both versions ; DVD-ROM feature: Radio Times listings ; Production notes.