Meganulon

Meganulon is a kaiju created by Toho Co. Ltd. that first appeared in the 2000 film Godzilla vs. Megaguirus. Meganulon's first appearance in the fan-made Kyojin Godzilla Series is the upcoming 2019 fan-film Mothra: Defender of Earth.

Mothra: Defender of Earth
Meganulon is the first evolution of Megaguirus. After Station 61 found a Space Amoeba in Earth's atmosphere, the Amoeba quickly merged with a Dragonfly, creating Meganulon. She quickly killed everyone on the Station 61 and destroyed the station itself, jetisoning her to Earth.

Trivia

 * She is portrayed by a Bandai Godzilla vs. Megaguirus Blister Pack Meganulon.