Cast: Alan MacNaughtan (Brandon), Patrick Newell (Smallwood), Terence Alexander ("Piggy" Warren), Jeremy Burnham (Vicar), Robert Brown (Saul), Juliet Harmer (Jill Mason), Walter Horsbrugh (School Inspector)
Uncredited: Peter Brace (Soldier)
Teleplay By: Brian Clemens
Directed By: Roy Baker
Ep: 80
The Gravediggers
Cast: Ronald Fraser (Sir Horace Winslip), Paul Massie (Johnson), Caroline Blakiston (Miss Thirlwell), Victor Platt (Sexton), Charles Lamb (Fred), Wanda Ventham (Nurse Spray), Ray Austin (Baron), Steven Berkoff (Sager), Bryan Mosley (Miller), Lloyd Lamble (Dr. Marlowe)
Uncredited: Peter J. Elliot (Pallbearer), Harvey Hall (Pallbearer)
Teleplay By: Malcolm Hulke
Directed By: Quentin Lawrence
Ep: 81
The Cybernauts
Cast: Michael Gough (Dr. Armstrong), Frederick Jaeger (Benson), Bernard Horsfall (Jephcott), Bert Kwouk (Tusamo), John Hollis (Sensai), Ronald Leigh-Hunt (Lambert), Gordon Whiting (Hammond)
Uncredited: John Franklyn-Robbins (Gilbert), Katherine Schofield (Oyuka), Diane Clare (Secretary)
Teleplay By: Philip Levene
Directed By: Sidney Hayers
Ep: 82
Death at Bargain Prices
Cast: Andre Morrell (Horatio Kane), T.P. McKenna (Wentworth), Allan Cuthbertson (Farthingale), George Selway (Massey), Harvey Ashby (Marco), John Cater (Jarvis), Peter Howell (Professor Popple), Ronnie Stevens (Glynn), Diane Clare (Julie)
Uncredited: Arthur Gross (Moran)
Teleplay By: Brian Clemens
Directed By: Charles Crichton
Ep: 83
Castle De'ath
Cast: Gordon Jackson (Ian), Robert Urquhart (Angus), Jack Lambert (McNab), James Copeland (Roberton), Russel Waters (Controller)
Teleplay By: John Lucarotti
Directed By: James Hill
Ep: 84
The Master Minds
Cast: Laurence Hardy (Sir Clive Todd), Patricia Haines (Holly Trent), Bernard Archard (Desmond Leeming), Ian McNaughton (Dr. Fergus Campbell), John Wentworth (Sir Jeremy), Georgina Ward (Davinia Todd), Manning Wilson (Major Plessy)
Uncredited: Harvey Hall (Heavy in Teaser), Harry Hutchinson (Sir Clive's Butler)
Teleplay By: Robert Banks Stewart
Directed By: Peter Graham Scott
Ep: 85
The Murder Market
Cast: Patrick Cargill (Mr. Lovejoy), Suzanne Lloyd (Barbara Wakefield), Naomi Chance (Mrs. Stone), Peter Bayliss (Dinsford), John Woodvine (Robert Stone), Edward Underdown (Jonathan Stone), Barbara Roscoe (Receptionist), John Forgham (Beale)
Uncredited: Penelope Keith (Bride)
Teleplay By: Tony Williamson
Directed By: Peter Graham Scott
Ep: 86
A Surfeit of H2O
Cast: Noel Purcell (Jonah Barnard), Albert Lieven (Dr. Sturm), Sue LLoyd (Joyce Jason), Talfryn Thomas (Eli Barker), John Kidd (Sir Arnold Kelly), Geoffrey Palmer (Martin Smythe)
Uncredited: Terry Plummer (Frederick), John Bennett (Heckler)
Teleplay By: Colin Finbow
Directed By: Sidney Hayers
Ep: 87
The Hour That Never Was
Cast: Gerald Harper (Geoffrey Risdale), Dudley Foster (Philip Leas), Roy Kinnear (Hickey), Roger Booth ("Porky" Purser), Daniel Moynihan (Corporal Barman), David Morrel (Wiggins), Fred Haggerty (Driver)
Uncredited: John Bennett (Cook), Ray Austin (Dead Milkman)
Teleplay By: Roger Marshall
Directed By: Gerry O'hara
Ep: 88
Dial a Deadly Number
Cast: Clifford Evans (Henry Boardman), Jan Holden (Ruth Boardman), Anthony Newlands (Ben Jago), John Carson (Fitch), Peter Bowles (John Harvey), Gerald Sim (Frederick Yuill), Michael Trubshawe (The General), Norman Chappell (Macombie), John Bailey (Warner), Edward Cast (Waiter)
Uncredited: Tina Packer (Suzanne)
Teleplay By: Roger Marshall
Directed By: Don Leaver
Ep: 89
Man-Eater of Surrey Green
Cast: Derek Farr (Sir Lyle Peterson), Athene Seyler (Doctor Sheldon), Gillian Lewis (Laura Burford), William Job (Alan Carter), David Hutchenson (Wing Commander Davies), Joe Ritchie (Publican), Donald Oliver (Bob Pearson), Toby Blanshard (Joe Mercer)
Uncredited: Edwin Finn (Professor Taylor), Harry Shacklock (Professor Knight), Ross Hutchinson (Dr. Connelly), John G. Heller (Lennon)
Teleplay By: Philip Levene
Directed By: Sidney Hayers
Ep: 90
Two's a Crowd
Cast: Warren Mitchell (Brodny), Maria Machado (Alicia Elena), Alec Mango (Shvedloff), Wolfe Morris (Pudeshkin), Julian Glover (Vogel), John Bluthal (Ivenko), Eric Lander (Major Carson)
Teleplay By: Philip Levene
Directed By: Roy Baker
Ep: 91
Too Many Christmas Trees
Cast: Mervyn Johns (Brandon Storey), Edwin Richfield (Dr. Felix Teasel), Jeanette Sterke (Janice Crane), Alex Scott (Martin Trasker), Robert James (Jenkins), Barry Warren (Jeremy Wade)
Teleplay By: Tony Williamson
Directed By: Roy Baker
Ep: 92
Silent Dust
Cast: William Franklyn (Omrod), Jack Watson (Juggins), Conrad Phillips (Mellors), Norman Bird (Croft), Hilary Wontner (Minister), Joanne Wake (Miss Snow), Isobel Black (Clare Prendergast), Charles Lloyd Pack (Sir Manfred Fellows), Aubrey Morris (Quince), Robert Dorning (Howard)
Teleplay By: Roger Marshall
Directed By: Roy Baker
Ep: 93
Room Without a View
Cast: Paul Whitsun-Jones (Chessman), Peter Jeffrey (Varnals), Richard Bebb (Dr. Cullen), Philip Latham (Carter), Peter Arne (Pasold), Vernon Dobtcheff (Pushkin), Peter Madden (Dr. Wadkin)
Uncredited: Jeanne Roland (Anna Wadkin), Anthony Chinn (Oriental Interrogator), Romo Gorrara (Badly Made-Up Guard)
Teleplay By: Roger Marshall
Directed By: Roy Baker
Ep: 94
Small Game For Big Hunters
Cast: Bill Fraser (Colonel Rawlings), James Villiers (Simon Trent), Liam Redmond (Professor Swain), A.J. Brown (Dr. Gibson), Peter Burton (Fleming), Paul Danquah (Razafi), Tom Gill (Tropical Outfitter), Esther Anderson (Lala), Peter Thomas (Kendrick)
Uncredited: Billy Cornelius (Tribesman)
Teleplay By: Philip Levene
Directed By: Gerry O'hara
Ep: 95
The Girl From Auntie
Cast: Liz Frazer (Georgie Price-Jones), Alfred Burke (Gregorie Auntie), Bernard Cribbins (Arkwright), David Bauer (Ivanoff), Mary Merrall (Old Lady), Sylvia Coleridge (Aunt Hetty), Yolande Turner (Receptionist), Ray Martine (Taxi Driver), Maurice Browning (Russian), John Rutland (Fred Jacques)
Uncredited: Romo Gorrara (Guard)
Teleplay By: Roger Marshall
Directed By: Roy Baker
Ep: 96
The Thirteenth Hole
Cast: Patrick Allen (Reed), Hugh Manning (Colonel Watson), Peter Jones (Dr. Adams), Victor Maddern (Jackson), Francis Matthews (Collins), Donald Hewlett (Waversham), Norman Wynne (Professor Minley), Richard Marner (Man on T.V. Screen)
Teleplay By: Tony Williamson
Directed By: Roy Baker
Ep: 97
Quick-Quick Slow Death
Cast: Eunice Gayson (Lucille Banks), Maurice Kaufmann (Ivor Bracewell), Carole Gray (Nicki), Larry Cross (Chester Read), James Belchamber (Peever), John Woodnutt (Captain Noble), Alan Gerrard (Fintry), David Kernan (Piedi), Colin Ellis (Bernard), Graham Armitage (Huggins), Charles Hodgson (Syder), Ronald Govey (Bank Manager), Michael Peake (Willi Fehr)
Teleplay By: Robert Banks Stewart
Directed By: James Hill
Ep: 98
The Danger Makers
Cast: Nigel Davenport (Robertson), Douglas Wilmer (Dr. Long), Fabia Drake (Colonel Adams), Moray Watson (Peters), Adrian Ropes (Stanhope), Richard Coleman (R.A.F. Officer), John Gatrell (Lamble)
Cast: Peter Wyngarde (John Cartney), Colin Jeavons (Darcy), Carol Cleveland (Sara), Robert Cawdron (Horace), Michael Latimer (Roger Winthrop), Jeremy Young (Willy Frant), Bill Wallis (Tubby Bunn), Steve Plytas (Kartovski), Art Thomas (Pierre), Alf Joint (Big Man), Bill Reed (Huge Man)
Teleplay By: Brian Clemens
Directed By: James Hill
Ep: 100
What the Butler Saw
Cast: Thorley Walters (Hemming), John Le Mesurier (Benson), Denis Quilly (Group Captain Miles), Kynaston Reeves (Major General Goddard), Howard Marion Crawford (Brigadier Goddard), Humphrey Lestocq (Vice Admiral Willows), Ewan Hooper (Sergeant Moran), Leon Sinden (Squadron Leader Hogg), David Swift (Barber), Norman Scace (Reeves), Peter Hughes (Walters)
Teleplay By: Brian Clemens
Directed By: Bill Bain
Ep: 101
The House That Jack Built
Cast: Michael Goodliffe (Professor Keller), Griffith Davies (Burton), Michael Wynne (Withers), Keith Pyott (Pennington)
Teleplay By: Brian Clemens
Directed By: Don Leaver
Ep: 102
A Sense of History
Cast: Nigel Stock (Richard Carlyon), John Barron (Henge), John Glys-Jones (Grindley), John Ringham (Professor Acheson), Patrick Mower (Duboys), Robin Phillips (John Petit), Peter Blythe (Millerson), Peter Bourne (Allen), Jacqueline Pearce (Marianne)
Uncredited: Kenneth Benda (James Broom)
Teleplay By: Martin Woodhouse
Directed By: Peter Graham Scott
Ep: 103
How to Succeed... At Murder
Cast: Sarah Lawson (Mary), Angela Browne (Sara), Anne Cunningham (Gladys), Zeph Gladstone (Liz), Artro Morris (Henry), Jerome Willis (Joshua Rudge), Christopher Benjamin (Hooter), Kevin Brennan (Sir George Morton), David Garth (Barton), Robert Dean (Finlay), Sidonie Bond (Annie)
Teleplay By: Brian Clemens
Directed By: Don Leaver
Ep: 104
Honey For the Prince
Cast: Ron Moody (Hopkirk), Zia Mohyeddin (Prince Ali), George Pastel (Arkadi), Roland Curran (Vincent), Bruno Barnabe (Grand Vizier), Ken Parry (Bumble), Jon Laurimore (Ronny Westcott), Reg Pritchard (Postman), Peter Diamond (Bernie), Carmen Dean (Eurasian Girl), Richard Graydon (George Reed)
