Space Opera Support 3: Mysterious Passenger
Mysterious Passenger is a game aid for gamemasters running a space opera style game where the PCs own their own ship¸ and regularly transport passengers. It provides 6 possible adventure seeds for a "mysterious passenger" who comes on board¸ but doesn't seem quite right. Some of these seeds can be the entire focus of a session¸ while others may merely provide a diversion on the trip to make things interesting.
Mysterious Passenger can be used with any system. For more adventure seeds involving passengers¸ be sure to check out 15 Space Opera Passengers.