Hedorah (ヘドラ, Hedora), also known as the Smog Monster, is a fictional monster, or kaiju who first appeared in the 1971 Toho film Godzilla vs. Hedorah. Hedorah was named for Hedoro (へどろ), the Japanese word for sludge, slime, vomit or chemical ooze.

Hedorah (ヘドラ, Hedora), also known as the Smog Monster, is a fictional monster, or kaiju who first appeared in the 1971 Toho film Godzilla vs. Hedorah. Hedorah was named for Hedoro (へどろ), the Japanese word for sludge, slime, vomit or chemical ooze.