The U.S.S. Orion was the first of a new breed of spacecraft, capable of near light and faster than light travel, powered by nuclear bombs and an alcubiere drive. It was almost five miles long and could stay in deep space indefinitely.
But there was one problem. It was gone, on activating the alcubiere drive it vanished, flying past the planet it was targeting and off into deep space.
We would play the crew of the Orion, simply trying to make it home or to another habitable planet