The alien craft, as far as we could tell, gained their propulsion from dark matter ejectors at the stern.

Well, we guessed it was the stern - it was impossible to tell as it moved in up to eleven dimensions.

It looked for all the world like it was grown rather than built, its chaotically organic shape putting one Petty Officer in mind of a piece of driftwood from his home on Earth 2. The comparison seemed apt, and we called them ‘Drift Ships’, or used the acronym ‘DRFTSHPS’ when too lazy to use vowels.

We did not initially know of their intentions. Nor do we now. They leave as quickly as they appear, that is to say - as if they were never there.

The only communication thus far has been a complete and indiscriminate meltdown of anything we thought we knew about physics...