Unidentified spaceship

The Alien Ship (from Grace) was a starship several times the size of the Prometheus. Armed with very powerful energy weapons capable of depleting a 303's shields in a matter of minutes, the ship's technology rivaled that of the Prometheus. It also seems to possess the ability to slightly change its shape. The craft also possessed a kind of beaming technology.

In 2004 when Prometheus encountered the vessel, the ship quickly opened fire forcing the Prometheus to retreat into a gas cloud. As the ship quickly followed, they both became trapped in the gas cloud but not before beaming the entire crew, save Samantha Carter, off the Prometheus. Eventually though, Carter traded the aliens aboard the ship a way to escape the gas cloud in exchange for releasing the Prometheus' crew.