Starring Shaun Cassidy (Joe Hardy), Parker Stevenson (Frank Hardy), Pamela Sue Anderson (Nancy Drew, 1977-1978), and Janet Louise Johnson (Nancy Drew, 1978). 44 episodes. Executive Producer: Glen A. Larson.
Series I (14 episodes, 1977)
1.1/1. "Mystery of the Haunted House" [The Hardy Boys] (30 Jan. 1977)
1.2/2. "The Mystery of Pirates Cove" [Nancy Drew] (6 Feb. 1977)
1.3/3. "The Mystery of Witches Hollow" [The Hardy Boys] (13 Feb. 1977)
1.4/4. "The Mystery of the Diamond Triangle" [Nancy Drew] (20 Feb. 1977)
1.5/5. "The Disappearing Floor" [The Hardy Boys] (6 Mar. 1977)
1.6/6. "The Secret of the Whispering Walls" [Nancy Drew] (13 Mar. 1977)
1.7/7. "The Flickering Torch Mystery" [The Hardy Boys] (27 Mar. 1977)
1.8/8. "A Haunting We Will Go" [Nancy Drew] (3 Apr. 1977)
1.9/9. "The Mystery of the Flying Courier" [The Hardy Boys] (10 Apr. 1977)
1.10/10. "Mystery of the Fallen Angels" [Nancy Drew] (17 Apr. 1977)
1.11/11. "Wipe Out" [The Hardy Boys] (24 Apr. 1977)
1.12/12. "The Mystery of the Ghostwriter's Cruise" [Nancy Drew] (1 May 1977)
1.13/13. "Mystery of the Jade Kwan Yin" [The Hardy Boys] (15 May 1977)
1.14/14. "Mystery of the Solid Gold Kicker" [Nancy Drew] (22 May 1977)
Series II (20 episodes, 1977-1978)
2.1/15. "The Hardy Boys & Nancy Drew Meet Dracula" (Part One) [The Hardy Boys & Nancy Drew] (11 Sept. 1977)
2.2/16. "The Hardy Boys & Nancy Drew Meet Dracula" (Part Two) [The Hardy Boys & Nancy Drew] (18 Sept. 1977)
2.3/17. "The Mystery of King Tut's Tomb" [The Hardy Boys] (25 Sept. 1977)
2.4/18. "The Mystery of the Hollywood Phantom" (Part One) [The Hardy Boys & Nancy Drew] (2 Oct. 1977)
2.5/19. "The Mystery of the Hollywood Phantom" (Part Two) [The Hardy Boys & Nancy Drew] (9 Oct. 1977)
2.6/20. "Mystery of the African Safari" [The Hardy Boys] (16 Oct. 1977)
2.7/21. "The Creatures Who Came on Sunday [The Hardy Boys] (30 Oct. 1977)
2.8/22. "The Strange Fate of Flight 608" [The Hardy Boys] (6 Nov. 1977)
2.9/23. "Acapulco Spies" [The Hardy Boys] (13 Nov. 1977)
2.10/24. "Nancy Drew's Love Match" [Nancy Drew] (20 Nov. 1977)
2.11/25. "The Mystery of the Silent Scream" [The Hardy Boys] (27 Nov. 1977)
2.12/26. "Will the Real Santa Claus...?" [Nancy Drew] (18 Dec. 1977)
2.13/27. "The Lady on Thursday at Ten" [Nancy Drew] (1 Jan. 1978)
2.14/28. "Oh Say Can You Sing" [The Hardy Boys] (8 Jan. 1978)
2.15/29. "The House on the Possessed Hill" [The Hardy Boys] (22 Jan. 1978)
2.16/30. "Sole Survivor" [The Hardy Boys] (29 Jan. 1978)
2.17/31. "Voodoo Doll" (Part One) [The Hardy Boys & Nancy Drew] (12 Feb. 1978)
2.18/32. "Voodoo Doll" [The Hardy Boys & Nancy Drew] (Part Two) (19 Feb. 1978)
2.19/33. "Mystery of the Avalanche Express" [The Hardy Boys & Nancy Drew] (26 Feb. 1978)
2.20/34. "Death Surf" [The Hardy Boys] (12 Mar. 1978)
Series III [The Hardy Boys Mysteries] (10 episodes, 1978-1979)
3.1/35. "The Last Kiss of Summer" (Part One) (2 Oct. 1978)
3.2/36. "The Last Kiss of Summer" (Part Two) (8 Oct. 1978)
3.3/37. "Assault on the Tower" (15 Oct. 1978)
3.4/38. "Search for Atlantis" (22 Oct. 1978)
3.5/39. "Dangerous Waters" (29 Oct. 1978)
3.6/40. "Scorpion's Sting" (5 Nov. 1978)
3.7/41. "Defection to Paradise" (Part One) (19 Nov. 1978)
3.8/42. "Defection to Paradise" (Part Two) (26 Nov. 1978)
3.9/43. "Game Plan" (3 Dec. 1978)
3.10/44. "Life on the Line" (14 Jan. 1979)