Four new clips from Ridley Scott's Alien semi-prequel Prometheus have been released, teasing some pre-mission scenes and some big action set pieces that look pretty awesome.

It was 35 years ago this week that Star Wars hit silver screens around the world and changed movies forever. Three and a half decades, six flicks of varying quality, two TV series and countless books, comics, toys, fan films and cosplayers later, it's still one of the most influential cultural touchstones ever, and Hollywood's biggest geeks still turn to it for inspiration.

Two new Prometheus trailers have been released, showing off some new action footage—including two aliens going head-to-head, and some different shots of what appears to be a space jockey.

Some new concept art and behind-the-scenes pics from Ridley Scott's sci-fi opus Prometheus have been released, which give some breathtaking looks at the pre-Alien world he is building.