A final point to add to all the other bad reviews

Rating: 1/10 (22 April 2019)

I switched off half way thru, deeply regretting that I hadn't switched off earlier, and thus had unnecessarily wasted 20 minutes of my life. The reason I switched off (apart from all the technical contradictions and nonsense pointed out by everyone else)? Well, by now the creature had killed or maimed 3 people in a brutal and horrific way, yet they were still calling it Calvin! So if the name chosen by the school kids had been 'Fluffy', or 'Darling', they'd still be calling it that? So the movie is not just technically and logically a joke, its also a joke in its grasp of human emotions. Every time they called this creature, which can potentially wipe out the entire human race, 'Calvin', I cringed.