My rating: ***
This is an entertaining time travel thriller where a butterfly accidentally trodden on by a time traveller in prehistoric times leads to catastrophic results for the present. It is a race against time, re-evolution, monstrous plants and dinosaur-like animals for our scientist heroes to get back to the past and undo the damage. Nobody is taking things too seriously in this film and it is an enjoyable but forgettable ride. Ben Kingsley enjoys himself hamming it up outrageously as an evil corporate money obsessed mogul.
The film is an updated and very loose version of a short story of the same name published by Ray Bradbury in Colliers Magazine in 1952. On the origins of the popular term ‘butterfly effect’ used in chaos theory see the Wikipedia article. Bradbury’s story helped to popularise the metaphor.