Zetton is a beetle-like Kaijū that first appeared in the final episode of the series Ultraman. First appearing in the series as the bioweapon invasion monster of the Zetton aliens, Zetton is considered to be the most powerful monster in the original Ultraman series, and has made many other appearances. 
Hyper Zetton (Imago) is the adult form of Hyper Zetton, modified and much more powerful version of the original Zetton created by Alien Bat as his weapon to bring death to the universe.

ZET-TON.