It was some wierd figure, can't remember who it was, that I got at Service Merchandise when I was about 7. He had black legs and a clear chest plate that showed his inerds.
As a faux adult my first one was a custom Keaton Batman.
That was Pulsar's enemy Hypnos. A pretty rare figure even back then. Technically, he was a 1/5 scale figure.
https://www.bugeyedmonster.com/toys/pulsar/