Wow, a real find! Less than 100 user ratings? Unbelievable! The other reviewers say it is a spoof of Mario Bava's DANGER: DIABOLIK (1968), but it was released months BEFORE that movie... it rather spoofs the comic-book character Diabolik (existing since 1962).
"Delightful, virtually unknown comedy about a bumbling Scotland Yard inspector (Terry-Thomas), who comes to Southern France to catch costumed super-criminal Dorellik (Dorelli). The charismatic anti-hero accepts the assignment to kill all the Duponts of the world for an inheritance, all the while bemoaning the fact that his sidekick/lover Lee has fallen out of love with him. Slapstick ensues. Crime comedy is a perfect showcase for Italian singer Dorelli and the always wonderful Terry-Thomas. A spoof of the comic book character Diabolik, not the Mario Bava movie of the same name, which was released several months after this. At times reminiscent of the Clouseau or Fantomas movies of the time.
"Delightful, virtually unknown comedy about a bumbling Scotland Yard inspector (Terry-Thomas), who comes to Southern France to catch costumed super-criminal Dorellik (Dorelli). The charismatic anti-hero accepts the assignment to kill all the Duponts of the world for an inheritance, all the while bemoaning the fact that his sidekick/lover Lee has fallen out of love with him. Slapstick ensues. Crime comedy is a perfect showcase for Italian singer Dorelli and the always wonderful Terry-Thomas. A spoof of the comic book character Diabolik, not the Mario Bava movie of the same name, which was released several months after this. At times reminiscent of the Clouseau or Fantomas movies of the time.