First aired: Aug/07/1969

First aired: Apr/07/1970
Guest star: Dorothy De Gamage (Mother Superior), Roy Boyd (Anton), Simon Taylor (Customs Officer), Noel Harverson (Lip Reader), Hans Meyer (General Hovaths), Christopher Owen (Bridge), David Butler (Police Captain), David Prowse (Bodyguard)

First aired: Apr/14/1970
Guest star: Patrick Allen (Morgan), George Roderick (Security Officer), John Slavid (Receptionist)

First aired: Apr/21/1970
Guest star: Gary Watson (Tellor), Tim Condren (Lormi), Desmond Llewelyn (Barrett), Alan Cullen (Lavell), Richard Hurndall (Arturo), Norman Henry (Barford), Tony Ellis (Pelli), Patricia Hastings (Lady Radley), Maureen Lipman (Lisa)

First aired: Apr/28/1970
Guest star: Burnell Tucker (U.S. Sergeant), Ann Curthoys (Nina), John Welsh (Mallory), Candida Fawsitt (Girl), Jerry Stovin (U.S. Colonel), William Corderoy (Sergeant Smith), Simon Kelly (Barman), Tania Robinson (Paula), John Woodnutt (Colonel Field), Tony Caunter (Mullins), James Bree (Meyer), Michael Hawkins (Bryant), Tenniel Evans (Linton)

First aired: May/05/1970
Guest star: Robin Browne (Policeman), Gil Sutherland (Thornton), Hildegarde Neil (Zeta Baker), Noel Johnson (Melton), Jonathan Newth (Lambert), Michael Lynch (Nelson), Harry Oatten (Stanley Kerr)

First aired: May/12/1970
Guest star: Nik Zaran (Prodnik), Norman Florence (Gorin), James Hall (Policeman), Drew Wood (Monitor), Vernon Morris (Navigator), Robin Browne (Monitor), Godfrey Jackman (Pilot), Dave Carter (Policeman), Jeremy Anthony (Co-Pilot), George Pravda (Kaldor)

First aired: May/19/1970
Guest star: Reginald Peters (Mario), Tom Watson (Plumper), Stanley Hollingsworth (Narozny), Ronald Magill (Armitage), Jean Anderson (Penelope Blanshard), Brian Tully (Kershaw), June Watson (Irene Plumper)

First aired: May/26/1970
Guest star: David Simeon (Desk Clerk), Richard Heffer (Gregor), Barry Dennen (Kirby), Guy Deghy (Josef), Olaf Pooley (Istov), Deborah Stanford (Rena Szarvos)

First aired: Jun/02/1970
Guest star: Raymond Mason (Eckert), John Bailey (Bailey), Dudley Foster (Bazna), Roger Delgado (Rogov), Brian Oulton (Harrison)

First aired: Jun/09/1970
Guest star: Hilda Campbell-Russell (Entranced Woman), Amanda Walker (Marcadio), John Savident (Largo), David Lyell (Wykham), Andrew Sachs (Stein), Terence Alexander (Thorens), Roy Stephens (Foster), Hans De Vries (Porgio)

First aired: Jun/16/1970
Guest star: Neil Stacy (Dr. Petrie), Geoffrey Toone (Karl Dickinson), Denis Carey (Professor Radmore), Elaine Ives-Cameron (Russian Woman), Maria Aitken (Mrs. Petrie), Gordon Pitt (Lawson), Denzil Ellis (Professor Rajek), Martin Gordon (Dr. Witold), Steve Peters (Cypher Expert)

First aired: Jun/23/1970
Guest star: Kate O'Mara (Helen Lingard), John Byron (Professor Moran-Williams), Tony Wright (Samford), Vernon Dobtcheff (Herman Voss), Geoffrey Bayldon (Blair), Anthony Gardner (Paul Densley), Rio Fanning (Goric), Bill Treacher (Taxi Driver), Bill McCabe (Chauffeur), Christopher Robbie (Leslie Johnson)

First aired: Jun/30/1970
Guest star: Ray Edwards (Krasov), Clare Kelly (Tanya Czelkova), Norman Shelley (Charles), Derek Francis (Vaslva Baroviev), Robert Tayman (Peter Barraux)