Carrion

it's red but anyways story: it's a creature that was created in a lab it's a red blob of teeth and tentacles it broke out of it's test tube and started eating and killing the researchers they sent soldiers and armed some people just in case but it still got by ( your one of the researchers in a bio hazard suit testing a chemical until you checked the cameras and saw it you ran to the nearest armory and grabbed a rifle and ran downstairs to plan your move) one more thing...it can turn human ( good luck)