This is a Random Event.
- At first it appears you've arrived in an empty system, but a ship appears from behind a planet and hails you: "Haha! I am the dread pirate Tuco, prepare to die!"
- Continue ...
- Nothing special for killing the crew. Standard fight with ship appropriate for the sector.
Note: This may be a reference to the movie and novel The Princess Bride. Instead of Tuco, it is The Dread Pirate Roberts.
Note 2: Tuco is the dirty gunslinger from The Good, The Bad, and the Ugly.