- Ep: 37
- The Last Kiss of Summer
- Cast: Anne Lockhart (Jess), Mills Watson ( ), Kevin Tighe (Steve), Kevin Brophy (Jocco Halsey), Kristie Welsch (Jaimie), Vince Howard ( ), Harold Ayer (Minister), Kristian Jennifer (1st Volleyball Player), Betty Jean Samuelson (2nd Volleyball Player), Kathy McCullen (Sharon), Ryan McDonald ( ), Liberty Godshall (1st Girl), Sandy Charles (2nd Girl)
- Written By: Glen A. Larson & Michael Sloan
- Directed By: Vince Edwards
- Ep: 38
- The Last Kiss of Summer, Part 2
- Cast: Anne Lockhart (Jess), Mills Watson ( ), Kevin Tighe (Steve), Kevin Brophy (Jocco Halsey), Kristie Welsch (Jaimie), Vince Howard ( ), Harold Ayer (Minister), Kristian Jennifer (1st Volleyball Player), Betty Jean Samuelson (2nd Volleyball Player), Kathy McCullen (Sharon), Ryan McDonald ( ), Liberty Godshall (1st Girl), Sandy Charles (2nd Girl)
- Teleplay By: Glen A. Larson & Michael Sloan
- Story By: Glen A. Larson & Michael Sloan & Rebecca Snow
- Directed By: Vince Edwards
- Ep: 39
- Assault on the Tower
- Cast: Dana Andrews (Townley), Victor Holchak (Carstairs), James Booth (Lieutenant Buckley), Leon Ames (Messenger), Patrick MacNee (S), Pernell Roberts (Detective Superintendant Molly), Peter Ashton (Wakefield), Ian Abercrombie (Sergeant Lander), Shepard Sanders ( ), Joi Staton ( ), Cort Brackett ( )
- Written By: Michael Sloan & Christopher Crowe
- Directed By: Winrich Kolbe
- Ep: 40
- Search For Atlantis
- Cast: Lloyd Nolan (Professor Hendricks), Darleen Carr (Helena Martin), John Colicos (Colonel Morbius), Duncan Gamble (Skip McTeague), Gino Conforti (Desk Clerk), Pamela Jean Bryant (Jeanette), Peter Weiss (Vittorio), Tanya George (Greek Dancer), Kopi Sotiropulos (Miklos)
- Written By: Steven E. De Souza
- Directed By: Don McDougall & Edward Abroms
- Ep: 41
- Dangerous Waters
- Cast: Dane Clark (Hanson), Rebecca York (Ria Thomas), Frank Marth (Migley), Robert Loggia (Maurice), June Lockhart (Mrs. Migley), Maud Strand (Noel), Austin Stoker (Perfect), Tom Castronova (Regis), Tom Newman (Phillipe)
- Written By: Lee Sheldon
- Directed By: Richard Benedict
- Ep: 42
- Scorpion's Sting
- Cast: Craig Stevens (Scorpion), Joseph Ruskin ( ), Macdonald Carey ( ), Robin Mattson (Catherine Martin), Nina Axelrod ( ), Don Diamond (Lieutenant Rogers), Walter Klenhard (Smith)
- Written By: Michael Sloan & Christopher Crowe
- Directed By: Dennis Donnelly
- Ep: 43
- Defection to Paradise
- Cast: Nehemiah Persoff (Vladimir Christovan), Edd Byrnes (Paul Owens), Bobby Van ( ), Pamela Franklin (Marla), David Gates (Himself), Larry Knetchel ( ), Michael Botts ( ), Robert Feero (Kellgyn), Eric Lawrence (Vince Carrol), Blake Marion ( ), Doug Heyes, Jr. (Jerry), Lloyd Kino (Lieutenant Andy Ho)
- Written By: Glen A. Larson & Michael Sloan
- Directed By: Ray Austin
- Ep: 44
- Defection to Paradise, Part 2
- Cast: Nehemiah Persoff (Vladimir Christovan), Edd Byrnes (Paul Owens), Bobby Van ( ), Pamela Franklin (Marla), David Gates (Himself), Larry Knetchel ( ), Michael Botts ( ), Robert Feero (Kellgyn), Eric Lawrence (Vince Carrol), Blake Marion ( ), Doug Heyes, Jr. (Jerry), Lloyd Kino (Lieutenant Andy Ho)
- Written By: Glen A. Larson & Michael Sloan
- Directed By: Ray Austin
- Ep: 45
- Game Plan
- Cast: Mary Louise Weller (Annie Metzger), Nancy Morgan (Special Agent Melanie Wilson), Jim B. Raymond (Hank Colby), Robert E. Oram (Mike Smith), Dennis Holahan (Arthur Philips), Eric Lawrence (Agent Vince Carroll), John DeRose (Dice Player), Joseph LaCava (Sam)
- Written By: Steven E. DeSouza
- Directed By: John J. Dumas
- Ep: 46
- Life On the Line
- Cast: Karen Lamm (Debbie Lawford), Ben Hammer ( ), Adam Roarke ( ), Ana Alicia (Suzanne Clifford), Paul Coufos ( ), Leonard Stone ( ), Marvin Walters (Fields), Wally Crowder (Thompson)
- Teleplay By: Gil Grant
- Story By: Arlene Sidaris & Joyce Brotman
- Directed By: Sidney Hayers
| Shaun Cassidy .......................... Joe Hardy |
| Parker Stevenson ..................... Frank Hardy |
| Edmund Gilbert ...................... Fenton Hardy |
| Jack Kelly ......................... Harry Hammond |
