The Gamma 7A system was an inhabited planetary system with a fourth-magnitude primary and billions of inhabitants in Sector 39J. In 2268, after contact had been lost with the system, Starfleet Command sent the USS Intrepid to investigate. Like the system, the Intrepid was destroyed by a space amoeba. Soon after contact with the starship ceased, Starbase 6 ordered the USS Enterprise to investigate; the ship was finally able to destroy the amoeba. (TOS: "The Immunity Syndrome" )