Saucer Out of Time
The mystery is that no one knows which ship this is. Its name and hull number are completely odd and the still functioning computer is protected by an encryption code which is neigh uncrackable...well Data may be able to do it...
Once the encryption is cracked the information that comes out is completely jumbled almost in the style of crackpot prophecy...hidden in double meanings. Then slowly things begin to happen in line with what the computer is spitting out and the last entry is a prediction of the end of the Federation...so can the PCs stop it from coming to past or do they cause the whole problem by downloading the computer core into their ship's computer...
Arise, arise, Riders of Theoden!
Fell deed awake: fire and slaughter!
Spear shall be shaken, shields be splintered,
a sword-day, a red-day, ere the sun rises!
Ride now, ride now! Ride to Gondor!
Theoden King: The Return of the King