Ken Malansky, a law student of Perry Mason's, is accused of murdering a fellow student. Perry is reluctant to take on his case as the victim was the son of a close friend.
Unfortunately the movie Perry Mason: The Case of the Lethal Lesson is not yet available on Disney Plus.
| Directing | Christian I. Nyby II | Director |
| Writing | Erle Stanley Gardner | Novel |
| Sound | Fred Steiner | Original Music Composer |
| Production | Robert Hamilton | Supervising Producer |
| Editing | David Solomon | Editor |
| Art | Paul Staheli | Art Direction |
| Production | Peter Katz | Producer |
| Production | Joel Steiger | Supervising Producer |
| Writing | Robert Hamilton | Teleplay |
| Sound | Dick DeBenedictis | Music |
| Writing | Dean Hargrove | Story |
| Camera | Arch Bryant | Director of Photography |
| Writing | Joel Steiger | Story |
| Costume & Make-Up | Ronn Rynhart | Costume Designer |
| Production | Fred Silverman | Executive Producer |
| Production | Reuben Cannon | Casting |
| Sound | James Emerson | Production Sound Mixer |
| Production | Donna Colabella | Production Executive |
| Production | Robert Benevides | Production Consultant |
| Crew | Gil Talamantes | Transportation Coordinator |
| Production | Billy Ray Smith | Unit Production Manager |
| Production | Dean Hargrove | Executive Producer |
| Costume & Make-Up | Dee Sandella | Makeup Artist |
| Production | Carol Dudley | Casting |
| Production | Debbie Nodella | Production Accountant |
| Production | David Solomon | Co-Producer |
| Lighting | Bradford Lipson | Gaffer |
| Crew | Gary Jensen | Stunt Coordinator |
| Art | Charlie Helms | Set Decoration |
| Camera | Douglas O'Kane | First Assistant "A" Camera |
| Costume & Make-Up | Patti Dallas | Makeup Artist |
| Art | Wayne Fitzgerald | Main Title Designer |
| Crew | Dennis Smith | Legal Services |
| Directing | Gail Joyce Fortmuller | Second Assistant Director |
| Art | Jeff Petersen | Property Master |
| Crew | Hal Harrison | Post Production Supervisor |
| Costume & Make-Up | Rosanne Bigelow | Hairstylist |
| Directing | Jeff Glasser | Script Supervisor |
| Sound | Gregory H. Watkins | Sound Re-Recording Mixer |
| Costume & Make-Up | Sharon T. Brunn | Costumer |
| Production | Karen Beard | Location Manager |
| Sound | Sam Horta | Supervising Sound Editor |
| Lighting | Jerry Jencks | Gaffer |
| Art | Randy Holland | Construction Coordinator |
| Production | Andrea Korkut | Production Coordinator |
| Editing | Leslie Sackheim | Assistant Editor |
| Costume & Make-Up | Kelly Andrew King | Costumer |
| Costume & Make-Up | Judee Guilmette | Hairstylist |
| Directing | Gary Grillo | First Assistant Director |
| Sound | Jory A. Beckert | Sound Re-Recording Mixer |
| Sound | Leonard Peterson | Sound Re-Recording Mixer |
| Production | Mike Moder | Executive In Charge Of Production |
| Sound | Ted Roberts | Music Editor |
