地球防衛軍
, known by the pen name , was a Japanese screenwriter who wrote many films for Toho studios. Mabuchi scripted several films for director Ishirō Honda, including "Rodan", "The Mysterians", "Matango", "Frankenstein Conquers the World", "The War of the Gargantuas", "King Kong Escapes", and "Destroy All Monsters". He was a member of the Japanese Communist Party whose screenplays often included political themes. His scripts are frequently contrasted with those written by Shinichi Sekizawa, whose scripts for kaiju films typically had a more lightweight, "fun" tone.