L-374 was a planetary system with four planets, which was located near the L-370 system. Both systems were located in the same sector. The Rigel system was, as well, located near this system. The system was attacked by the "planet killer" in 2267. It had four terrestrial worlds that were charted prior to the attack; the surface temperature of one inner planet was that of molten lead and another had an atmosphere poisonous to humans; the two outer planets were consumed as fuel by the machine before it could be destroyed by the starships USS Enterprise and USS Constellation. (TOS: "The Doomsday Machine" )