The film opens with a marvellously atmospheric sequence of a night security guard being stalked by an aggressive man-size killer plant in a huge greenhouse. Illuminated by a night sky full of falling comets, the use of darkness with splashes of technicolor makes this visually very rich and introduces the triffid as a terrifying menace. For a British-made sci-fi story, this is an ambitious attempt to follow action across three countries, show society in ruins and portray (not quite as successfully) a rampaging army of killer plants! The grim early scenes of blinded populous are quite upsetting, a plane falls out of the sky because the pilot cannot see but he knows he is running out of fuel, a train crashes into a terminus and its blinded passengers can't help themselves amongst the wreckage... The film follows an American sailor, who has not been blinded by the comets, as he tries to reach safety. This story is intercut with a couple stranded in a lighthouse surrounded by Triffids - these scenes were all added by the (uncredited) director Freddie Francis after the original cut of the movie came in way under its correct running time. The woman in the lighthouse scenes is played by Janette Scott, who has been immortalised in the lyrics of the title song of "THE ROCKY HORROR PICTURE SHOW". If possible watch a widescreen version of this movie - it makes a lot more sense.