The L374 system's orbit was the location of a four worlds. The system was attacked by the doomsday machine in the year 2267. Out of the four rocky planets that were observed prior to the attack, the two outer planets were consumed as fuel by the machine before it could be destroyed by the Federation starships USS Enterprise and USS Constellation. (TOS episode: "The Doomsday Machine", TNG novel: Before Dishonor)