“Alien: Romulus” (** out of four) was a tired sequel about a group of space colonists (Cailee Spenny, David Jonsson, Archie Reneaux, and others) who scavenge an isolated space station and soon find that it has been infiltrated and overcame by (what else?) aliens. Sort of a greatest-hits of previous “Alien” entries; first half is plodding and dull but the second half finally delivers some scares and action and builds to a fervent finish. Very stylish cinematography from Galo Olivares and direction from Fede Alvarez (and a welcome CGI return with Ian Holmes) make this watchable but a definite sense of deja vu hangs over the proceedings.