SHADORAH
From Ryusei Ningen Zoon episode 10
Shadorah was one of Zone Fighter's most dangerous enemies. Made from Zone Fighters shadow, Shadorah drained energy from Zone Fighter. At one point Shadorah drained so much energy from Zone Fighter that Zone Fighter was forced to return to his human form. No other daikaijuu was able to do that.
Shadorah, Zone Fighter are © 1973 Toho E-B Co., Ltd. & Mannen Sha Advertising Agency