Holmes & Watson have one baffling clue to help them track down the crime of an American visitor in London.
| Actor | Role |
|---|---|
 Peter O'TooleSherlock Holmes (voice) | Sherlock Holmes (voice) |
| EEarle CrossDr. Watson (voice) | Dr. Watson (voice) |
 Judy NunnNot listed | Not listed |
 Ron HaddrickNot listed | Not listed |
 Shane BriantNot listed | Not listed |
 Ken WayneNot listed | Not listed |
| BBrian AdamsNot listed | Not listed |
 Henri SzepsNot listed | Not listed |