• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Pamela Sue Martin (Nancy Drew), John Van Dreelen (Mayor), Leon Askin (Haufman Berger)
• Special Appearance By: Paul Williams (Alison Troy)
• Special Guest Star: Lorne Greene (Inspector Stavlin)
• Also Starring: Edmund Gilbert (Fenton Hardy)
• Co-Starring: Ruth Cox (Bess Marvin), Carl Esmond (Kolbe), Bernie Taupin (Tim), Norbert Weisser (Gurd), Claude Bessy (Frenchie)
• With: Fritz Feld (Fritz), Norbert Schiller (Caretaker), Albert Carrier (Paris Hotel Clerk), Roger Til (Paris Police Officer), Walter Janowitz (Waiter)
• Written By: Glen A. Larson & Michael Sloan
• Directed By: Joseph Pevney

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Pamela Sue Martin (Nancy Drew), John Van Dreelen (Mayor), Leon Askin (Haufman Berger)
• Special Appearance By: Paul Williams (Alison Troy)
• Special Guest Star: Lorne Greene (Inspector Stavlin)
• Also Starring: Edmund Gilbert (Fenton Hardy)
• Co-Starring: Carl Esmond (Kolbe), Ruth Cox (Bess Marvin), John Bleifer (Jensen)
• With: Bernie Taupin (Tim), Norbert Weisser (Gurd), Claude Bessy (Frenchie), Martin Kosleck (First Citizen), Lidia Kristen (Maid), George Perina (Monk), Ben Frommer (Second Citizen), Larry Levine (Wolfman)
• Written By: Glen A. Larson & Michael Sloan
• Directed By: Joseph Pevney

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Cesare Danova (Moustapha), Elyssa Davalos (Wendy Bonner), Jeff David (Rashid), Val DeVargas ()
• And: Taryn Power (Helene Holstead)
• With: Thomas Allard (Tex), Janet Curtis (Blond), Joseph Abdullah (Melon Vendor)
• Written By: Robert C. Dennis
• Directed By: John Dumas

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Pamela Sue Martin (Nancy Drew), Clive Revill (Phil Bronson), Casey Kasem (Paul Hamilton)
• Special Guest Stars: J.D. Cannon (Jason Fox)
• And: Dennis Weaver (Himself)
• Special Appearance By: James Wainright (Arlo Weatherly)
• Co-Starring: Michael Quinn (Hargrove)
• With: Floyd Levine (Brandon), Sandie Newton (Mandy), Ruth Cox (Bess), Bob Navarro (Reporter), Ursaline Bryant (Ms. Foster)
• Written By: Michael Sloan
• Directed By: Steven H. Stern

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Pamela Sue Martin (Nancy Drew), Clive Revill (Phil Bronson), Casey Kasem (Paul Hamilton), Harry Rhodes (Lieutenant Astor)
• And: Lou Antonio (The Director)
• Special Guest Star: J.D. Cannon (Jason Fox)
• Special Appearance By: Robert Wagner (Himself), Jaclyn Smith (Herself), James Wainright (Arlo Weatherly)
• Co-Starring: John Lupton (Townsend), Floyd Levine (Brandon), Michael Quinn (Hargrove)
• With: Rick Goldman (Bert), Sandie Newton (Mandy), Armand Cerami (Hawkins)
• Written By: Michael Sloan
• Directed By: Steven H. Stern

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Stuart Whitman (Trevor Masters), Anne Lockhart (Sarah Masters), Harold Sylvester (Ngotu), Peter Bromilow (Saunders)
• And: Percy Rodriguez (Minister)
• Also Starring: Edmund Gilbert (Fenton Hardy)
• Co-Starring: Albert Popwell (Keino), Parley Baer (Doc Wilson)
• With: Alyscia Maxwell (Secretary), Brandyn Artise (Operator)
• Written By: Cliff Osmond
• Directed By: Joseph Pevney

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Bonnie Ebsen (Sharon Anderson), Victor Holchak (Agent Thomas), John Quade (Sheriff), Hunter von Leer (Agent Stone)
• Co-Starring: Britt Leach (), John Brandon ()
• With: Tony Dow (Mason), Robert Miano (Roth), Dan Goodman (Peter Harris)
• Written By: David H. Balkin
• Directed By: Winrich Kolbe

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Thayer David (), Robin Mattson (Carla Bradley), Kitty Ruth (Louise), William Sylvester ()
• Co-Starring: Herb Braha (), Susan Woollen (Margaret), Frank Parker (), Don Marshall (Flight Engineer), John Clavin ()
• With: Elena Frank (Lisa Lindsay), Rozelie Gayle (1st Twin), Byron Webster (1st Newsman), Warren Munson (Controller), Dennis Levine (Radar Operator), Gino Ardito (2nd Newsman)
• Written By: Christopher Crowe
• Directed By: Ronald G. Satlof

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Also Starring: Edmund Gilbert (Fenton Hardy)
• Guest Stars: Craig Stevens (Alexander Cartel), Deborah Ryan (Jackie), Kimberly Beck (Sue), Rudy Diaz (Carlos)
• Co-Starring: Jorge Cervera, Jr. (Ramone)
• With: Julio Medina (Clerk), Dante De Andre (Maitre D')
• Written By: Michael Sloan
• Directed By: Keith Atkinson

• Starring: Pamela Sue Martin (Nancy Drew)
• Also Starring: William Schallert (Carson Drew)
• Guest Stars: Maureen McCormick (Karen Phillips), Roger C. Carmel (John Bender), Susan Buckner (George Fayne), Jack Colvin (Lieutenant), Charles Robinson (Roper), Stephen McNally (Mr. Phillips)
• And: Nico Minardos (Paco)
• Special Guest Star: Christopher Connelly (Sandy Castelli)
• With: Eugene Peterson (Pit Boss), Mario Machado (Umpire), Gil Stratton (Announcer), Marilyn King (Mrs. Phillips), Larry Levine (Clerk)
• Teleplay By: John Ireland, Jr.
• Story By: Glen A. Larson & John Ireland, Jr.
• Directed By: Joseph Pevney

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Larry Storch (Jesse Miller), Martha Garrett (Alicia Peterson), Elizabeth Stack (Sally Kline), Val Avery (Tracy), Trini Lopez (Julio Ramirez)
• Co-Starring: Andy Romano (MacKenzie), Kenneth Tobey (Philip Chandler)
• With: Karen Fredrik (Mandy), John Dresden (Brock), Norman Bartold (Bradshaw), Norman Howell (Bellhop)
• Teleplay By: Alan Godfrey & Michael Sloan
• Story By: Alan Godfrey
• Directed By: John Dumas

• Starring: Pamela Sue Martin (Nancy Drew)
• Also Starring: William Schallert (Carson Drew)
• Guest Stars: Dan O'Herlihy (Griffin), Rick Springfield (Ned Nickerson), Susan Buckner (George Fayne), John Ericson (Captain Rogers)
• Co-Starring: William Campbell (Markham), Jorge Moreno (Cortez), John Roper (Lockhart), Walt Davis (Stewart)
• With: Peter MacLean (Haviland), Sparky Marcus (Charles), Missy Gold (Grace), Anthony Carbone (Harry Champion)
• Written By: Michael Sloan
• Directed By: Michael Pataki

• Starring: Pamela Sue Martin (Nancy Drew)
• Also Starring: William Schallert (Carson Drew)
• Guest Stars: John Karlen (Rocky), Nicholas Hammond (Burke), Tony Burton (Gilmore Lee), Jerry Quarry (Big Jerry)
• Special Guest Star: Simon Oakland (Lieutenant Eghan)
• Co-Starring: Brian Culhane (Hunch)
• With: Ron Henriquez (Chicano Fighter), Philip Kenneally (Desk Sergeant), Tony Mich (Officer)
• Written By: Christopher Crowe
• Directed By: Joseph Pevney

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Gene Evans (), Guy Stockwell (), Joe Bennett ()
• And: Debra Clinger (Harriett Alexander)
• Co-Starring: Nancy Stephens (Mrs. Morgan), Raynold Gideon (Morgan), Chip Lucia (Pete), Alex Sheafe (Dr. Freedman)
• With: Paul Regina (Steve), Sonny LaRocca (Eddie), Skip Ward (Cop), Brett Williams (Officer Shelley)
• Written By: Chris Conkling
• Directed By: Dennis Donnelly

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Also Starring: Edmund Gilbert (Fenton Hardy)
• Guest Stars: Melanie Griffith (Stacey Blain), Lloyd Bochner (Dr. Mann)
• And: Dorothy Malone (Mrs. Blain)
• Co-Starring: Royal Dano (Grant), Richard LePore (Allyn)
• With: Ed Crick (Jefferson), Wayde Preston (Sheriff), Jack Scalici (Hotel Clerk), Penelope Gillette (Hotel Woman), Robert Ball (Hotel Man)
• Written By: Michael Sloan
• Directed By: Daniel Haller

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Also Starring: Edmund Gilbert (Fenton Hardy)
• Guest Stars: Diana Muldaur (Leta Manheim), Robert Horton (Alan Kline), James Hong (Dr. Lo), Jean Marie Hon (Kim)
• And: Barry Primus (Peter Abrams)
• With: Michael Jackson (Newscaster), Chao-Li Chi (Professor Chaing), Luling Dixon (Nurse)
• Written By: Christopher Crowe
• Directed By: Christian I. Nyby II

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Ray Milland (Dr. Orin Thatcher), Julius Harris (Mr. Dove), Kim Cattrall (Marie Claire), Linda Dano (Josette), James Callahan (Haggarty), Johnny Sekka (), Bobby Troup (Piano Player)
• Special Guest Star: Howard Duff (Lieutenant Martinelle)
• And Introducing: Janet Louise Johnson (Nancy Drew)
• Co-Starring: Hal Frederick (Mabotu)
• With: Angelo Rossitto (Hawker), George Dunn (Bellman), Madeline Taylor (Old Woman), Jack Frey (Clown), Al Berry (Harlequin), Larry Watson (Skeleton), Eddra Gale (Fat Lady)
• And: Peter Forster (Desk Clerk)
• Teleplay By: Stephen Ujlaki & Mark Griffiths & Michael Sloan & Christopher Crowe
• Story By: Stephen Ujlaki & Mark Griffiths
• Directed By: Joseph Pevney

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Ray Milland (Dr. Orin Thatcher), Julius Harris (Mr. Dove), Kim Cattrall (Marie Claire), Linda Dano (Josette), James Callahan (Haggarty), Johnny Sekka ()
• Special Guest Star: Howard Duff (Lieutenant Martinelle)
• And Introducing: Janet Louise Johnson (Nancy Drew)
• Co-Starring: Hal Frederick (Mabotu)
• With: Angelo Rossitto (Hawker), Madeline Taylor (Old Woman)
• And: Peter Forster (Desk Clerk)
• Teleplay By: Michael Sloan & Christopher Crowe
• Story By: Stephen Ujlaki & Mark Griffiths
• Directed By: Joseph Pevney

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars Alphabetically: Susan Buckner (George Fayne), Edd Byrnes (Hans Mocton), Gary Crosby (Yates), Vic Damone (Conrad), Troy Donahue (Summerville), Fabian (Paul Leyton), Tommy Sands (Jerry Kanner), Deborah Walley (Gina Bartelli)
• And Special Guest Star: Janet Louise Johnson (Nancy Drew)
• With: Shep Sanders (Conductor)
• Teleplay By: Michael Sloan
• Story By: Susan Woollen
• Directed By: Christian I. Nyby II

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Maren Jensen (Maryann Dalton / Teri Turner), Jack Hogan (Mr. Turner), Tara Buckman (Bernie), Gary Wood (), John Mark Robinson (Mark Crawford)
• Special Guest Star: Jack Jones (Sam "Hubba" Hubblemeyer)
• Co-Starring: Ken Scott (Conrad), Donna Lynn Adrian (Model)
• With: Nathan Jung (Cho-Lin), Kenny Endoso (Rick)
• Teleplay By: Robert Earll
• Story By: Arlene Sidaris & Joyce Brotman
• Directed By: Ray Danton & Jack Arnold

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Also Starring: Edmund Gilbert (Fenton Hardy)
• And: Janet Louise Johnson (Nancy Drew)
• Guest Stars: Joseph Cotten (Weldon Rathbone), William Schallert (Carson Drew), Cathy Rigby (Greata's Daughter), Jack Kelly (Harry Hammond), Robert Sampson (Keller)
• Special Guest Star: Pernell Roberts (Chief Madison)
• Co-Starring: Brian Cutler (Captain Stevens), Zina Bethune (Janice), Regis J. Cordic (Paul Chase), Eric Server (Coleman), Colby Chester (McCall), Jeri Lea Ray (Greata)
• With: Carolyn Fromson (Laura), Amy Smika (Sally), Vince Howard (Lieutenant)
• Written By: Michael Sloan & Christopher Crowe
• Directed By: Christian I. Nyby II

• Starring: Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy)
• Guest Stars: Valerie Bertinelli (Wendy Chase / Gwynn), Jack Ging (Inspector Richards), Kim Lankford (Alice), Kario Salem (Alice's Ex-Boyfriend), Stepfanie Kramer (Jill Sommers)
• Co-Starring: Elissa Leeds (Trudy), Anthony De Longis (Sergio Morse), Derek Murcott (Dr. David Llewellyn), Richard Collier (Kaplan)
• With: Walter Klenhard (Officer), Robin Blair (1st Girl), Diane Markoff (2nd Girl), Beth Nufer (Gym Girl), Bob Clark (2nd Biker), Orwin Harvey (1st Biker), Nick Dimitri (Gimp), Bud Walls (Loud Guy)
• Teleplay By: Mark Griffiths & Stephen Ujlaki & Michael Sloan & Christopher Crowe
• Story By: Mark Griffiths & Stephen Ujlaki
• Directed By: Jack Arnold