Convinced that his long-time patient Nick Osborn didn't murder his boss, Mark Sloan starts investigating the case himself, supported by a junior doctor and a young female pathologist.
| Actor | Role |
|---|---|
 Dick Van DykeMark Sloan | Mark Sloan |
 Barry Van DykeSteve Sloan | Steve Sloan |
 Cynthia GibbAmanda Bentley | Amanda Bentley |
 Stephen CaffreyJack Parker | Jack Parker |
 Bill BixbyNick Osborne | Nick Osborne |
 Mariette HartleyKate Hamilton | Kate Hamilton |
 Ken KerchevalFrank Stevens | Frank Stevens |
 William AthertonEric Walker | Eric Walker |
 Brynn ThayerAnita Clifford | Anita Clifford |
 Vernee WatsonEsther Wiggins | Esther Wiggins |
 Michael MacRaeMr. Foss | Mr. Foss |
 Richard RedlinRussell Cord | Russell Cord |
 Shane MeierPaul McKinney | Paul McKinney |
 Arthur DuncanMr. Simms | Mr. Simms |
 Eliza RobertsMrs. McKinney | Mrs. McKinney |
 Shannon MarketicJackie Cole (uncredited) | Jackie Cole (uncredited) |