L'invasione dei mostri verdi

The book ends with the Triffids still a threat and Masen leaving for the Isle of Wight, hoping to eradicate them from the face of the Earth someday.

Tom and Karen are on a lighthouse situated on rocks when triffids appear. Tom turns a fire hose on them spraying the with salt water which causes them to melt in which case hoe did they survive the spray from the waves crashing on the rocks. The force of water from the hose Tom and Karen later use to destroy the triffids is much greater than what the triffid would have been subjected to by sea spray; when Karen told Tom about the triffid being on a rocky ledge and they returned to look for it, they were not soaked by the sea spray, so evidently the triffid would not have been either. As seen earlier in the film , the triffids grow incredibly quickly, so would only have been there for a few minutes when Karen saw it. In the short time she was away, the triffid moved away from the danger.

In pan & scan versions of this film, there is an extra scene as Bill & Susan depart England for France. They are seen on the small motorboat and Susan asks Bill "Where are we going?". Bill answers "We're going to that meeting in Paris, if we can make it". They then hear an explosion behind them, and we see that the ship they had just left from has exploded. We then see their small boat heading out to sea past an estuary lighthouse. This scene is missing from the letterbox versions.

Featured in Aweful Movies with Deadly Earnest: The Day of the Triffids (1975)