The second sequel to The Fly (1958), released in 1965. Unlike the two previous films, nobody turns into a fly-hybrid in this one.
While driving home, Martin Delambre, the grandson of the "turned-into-a-fly" Andre from the past films comes across one Patricia Gray running in the night, and gives her a lift since since she barely has any clothes on. They soon fall in love after this little encounter, and he marries her before taking her to his home. Unfortunately for each other, Patricia is an escapee from a mental asylum and Martin's family dabbles in experimental teleportation devices that have caused several horrifying accidents already.
This film has examples of:
- Broad Strokes: The film presents itself as a continuation of the previous two films, but its backstory is a mix between; only Andre Delambre from the first film was turned into a fly, and he was turned back into human the way Philippe was in the second film.
- Poor Communication Kills: As Martin prepares to send his father back to England with the teleportation device, his brother Albert tries in vain to tell him to not to do it, since he has destroyed the the machine on his end. Martin ignores him, and their father is lost inbetween.
- Rapid Aging: Martin's "curse" is that the teleportation experiments from the past have left him in a condition that causes him to age rapidly, which he holds back with special pills. When he fails to get his pills in the ending, he is soon reduced to bones.
- Revenge of the Sequel: Also an examples of The X of Y.
- Teleporter Accident: Delambres' teleportation experiments have turned several people into disfigured mutants, including two lab assistants and Martin' first wife.