Alien Dorzu appeared in 1974 TV series called Ultraman Taro. Alien Dorzu (ドルズ星人 Doruzu Seijin) was an alien that appeared in Ultraman Taro.
Alien Dorzu wouldn't have interacted with ZAT for a while if it weren't for a men in black's kidnappe to lose her red shoe which read "Mari". Kitjama became stressed after picking up the girl's shoe which made him have dreams about the girl with red shoes, known as Mari, to get kidnapped by a man wearing all black. Alien Dorzu then watches his dreams from his planet and commences "phase 2" of his unknown plan to invade Earth.
The next day Kitjama opens his door to notice a grown up Mari, it turns out Kitjama coincidentally had a friend called Mari when he was kid and was kidnapped by the same man in black. Tetsu Kitjama becomes extremely relived and talks with Mari for a while. Then when Kitjama goes to ZAT, Mari turns out to be in contact with Alien Dorzu and announces to him that phase 2 is complete. Alien Dorzu tells Mari that she will become a monster in 50 hours but first she needed to destroy ZAT HQ. As Kitjama and Mari have a chat again Kitjama senses a strange electric wave from his detector. Mari then distracts Kitjama as he falls into the plan of having Mari over to ZAT!
Then as Mari is went through inspection it is revealed that she does have strange electric waves from her being close to spoiling her cover, Then it is revealed that Mari was controlled to turn into a monster by Alien Dorzu leaving Mari to tears. Alien Dorzu was the man in black to kidnap Mari and turn her into Memole. Kitjama becomes terrified as he sees Dorzu turning Mari into Memole. As Kotaro resists to kill her, Dorzu's plan is at near success as Memole finally arises! As ZAT struggles to kill Memole with Kitjama feeling emotional Ultraman Taro arises and sends the monster to space. Then Kitjama sees a red shoe float up a lake and shots it after he saw Mari turn into a monster. This ends Dorzu's plans to invade Earth for good.