is a 1971 Japanese kaiju film directed by Yoshimitsu Banno, co-written by Banno and Takeshi Kimura, and produced and distributed by Toho Co., Ltd. It is the 11th film in the Godzilla franchise, and features the fictional monster characters Godzilla and Hedorah. The film stars Akira Yamauchi, Toshie Kimura, and Hiroyuki Kawase, with special effects by Teruyoshi Nakano, and features Haruo Nakajima as Godzilla and Kenpachiro Satsuma as Hedorah. Satsuma would go on to portray Godzilla in later Godzilla films.

Plot

The microscopic alien life-form Hedorah feeds on Earth's pollution and grows into a poisonous, acid-secreting sea monster. After he sinks an oil tanker and attacks Dr. Toru Yano and his young son Ken Yano, scarring the doctor, Hedorah's toxic existence is revealed to the public. Ken Yano has visions of Godzilla fighting the world's pollution and insists Godzilla will come to humankind's aid against Hedorah.