Sezon 4
Bölümler
1 Double Exposure 14 Şub 1974 2 Catherine the Great 21 Şub 1974 3 Jailbait 28 Şub 1974 4 Stand and Deliver 7 Mar 1974 5 Something about a Soldier 14 Mar 1974 6 Rendezvous 21 Mar 1974 7 Sounds Sinister 28 Mar 1974 8 Entente Cordiale 4 Nis 1974 9 Date of Birth 11 Nis 1974 10 Intercept 18 Nis 1974 11 Alien 25 Nis 1974 12 Diversion 2 May 1974 13 Downwind of Angels 9 May 1974