Zetton

Zetton (ゼットン, Zetton?), sometimes spelled "Z-Ton", is a fictional alien kaiju featured in the tokusatsu TV series, Ultraman (Urutoraman, 1966). As Ultraman's toughest opponent ever, Z-Ton first appeared in the show's final episode, #39, "Farewell, Ultraman". He was even popular enough to appear again in several subsequent Ultra Series.