Ultraman Dyna: Series
Ultraman Dyna: S1 E6 - The Biggest Monster On Earth
S1 E6:
A giant mushroom shaped monster suddenly appears from the ground through its own will and declares it will erase mankind. A bacterial thread makes its way all the way through the computer network and Super GUTS cannot prepare to intercept the attack the way they want to. Asuka's help is requested by the human form of the monster.