Yongary: Monster From The Deep

Yongary: Monster From The Deep is a 1967 South Korean-Japanese kaiju film by Kim Ki-duk. Yongary was created to rival the success of the Gojira and Gammera films made at the time.

Plot
Illo Nami is the husband of Soona and the uncle of Icho, who live in Seoul, South Korea, and an astronaut. One day, Illo is sent up into space to investigate the effects of nuclear tests in Central Europe. Then, earthquakes, caused by the tests, start and head towards Seoul, they turn out to be the work of a giant dinosaurian creature, dubbed "Yongary", after an old ledgend, by the local news stations.

As soon as Yongary makes landfall, Seoul is evacuated and the Korean Military send tanks after it, only to be destroyed. Yongary then heads to the local oil refinery. Icho follows Yongary there and he realizes Yongary feeds on oil, so he turns off the refineries, driving Yongary away. Then, Icho and his family tell the Korean Government that Yongary feeds on oil, so they have to lure it out with that, but they decide to use laser-guided missiles instead, despite that they might do more damage than Yongary.

After Yongary is seemingly killed byt the missiles, it wakes up and continues its rampage, it heads to the Han River, where a jets attack it only to be destroyed, allowing a helicopter to pour ammonia on it, with Illo, Soona and Icho on standby, watching Yongary's last few hours on Earth. The following morning, Icho tells the news stations that Yongary wasn't actually malevolent and had no other choice but to feed on oil.

Trivia

 * It spawned a 1999 American reimagining, which itself spawned an animated series.
 * Yongary's gender is unknown.