Blood-filled meat puppets

They are bringing an innocent looking flower type of thing (resilient little bastard called Calvin) from Mars to earth and the shit hits the fan. Instead of few negative comments, I knew nothing of this beforehand and it struck me good when the story took another gear. Haven't seen as cool frightening extra terrestrial thrills since Ridley Scott's Alien and, in truth, this is more a less its rip-off, but liked it just fine anyways.