Food of the Gods II

Food of the Gods II, sometimes referred to as Gnaw Food of the Gods II as well as Food of the Gods part 2, is a 1989 film that is a very loose sequel to the 1976 Bert I. Gordon film based on H.G. Wells novel, The Food of the Gods. It is a sequel in name only, as its plot bears no relation to the 1976 film.

Delhurst steals the serum sample and tests it, first on Neils pet rat Louise, then on a sample of cancer cells. He accidentally contaminates himself with treated cells and dies within minutes as his entire body develops massive tumors. Neil returns to the lab to retrieve the antidote he has created, testing it by destroying Delhursts transformed corpse. Meanwhile, the rats attack the swimming competition being held in the new sports complex, killing several people including Dean White.Neil uses the enlarged but stilldocile Louise, who is in heat, to lure the giant male rats into the university courtyard where Weizel and his men gun them all down. Neil phones Dr. Travis to inform her of the antidote, but it is too late Bobby, now psychotic and larger than ever, kills Travis while she is on the phone and escapes. ........

Source: Wikipedia