Rainbow Dash was perfectly happy with her life as a pirate. She had a FTL-capable battle cruiser, a mostly loyal crew that didn't try to kill her in the last three months and a hole bunch of money, but than she had to steal this strange alien artifact.
Now she is stuck together with her former friend and present enemy Applejack while the hole world is trying to kill them.

Crossover-tag because parts of the setting are inspired by the game Freelancer.