| Michael Caine | Harry Palmer |
| Nigel Green | Dalby |
| Guy Doleman | Ross |
| Sue Lloyd | Jean |
| Gordon Jackson | Carswell |
| Aubrey Richards | Radcliffe |
| Frank Gatliff | Bluejay |
| Thomas Baptiste | Barney |
| Oliver MacGreevy | Housemartin |
| Barry Raymond | Gray |
| Pauline Winter | Charlady |
| Anthony Blackshaw | Edwards |
| David Glover | Chilcott-Oakes |
Tasked with investigating the kidnappings and brainwashed reappearances of top scientists, including Dr. Radcliffe, the insubordinate British spy Harry Palmer navigates his way through criminals, secret agents, and his superiors . While attempting to bring in the suspect Bluejay, Palmer discovers a mysterious audiotape labeled ''IPCRESS,'' an inconspicuous, but ominous, piece of evidence.
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