Debate over the merits of Ridley Scott’s Prometheus is ongoing, and fuel was added to the fire recently when a behind-the-scenes image revealed an alien that didn’t actually appear in the film.  That image came from the pic’s opening sequence, and now two visual effects featurettes have gone online that give us a look at how WETA created the film’s memorable opening scene and how MPC created the film’s impressive spaceship and planetary effects, including the ship’s landing sequence.  It’s a nice look at how these integral portions of the film came to be, and the WETA featurette gives some insight into one of the more talked-about plot points of the film.Hit the jump to watch the videos, and if you missed our round-up of what we know about a possible Prometheus sequel so far click here.  Obviously, spoilers for Prometheus follow.Videos courtesy of The Daily (via /Film):