I saw these two "specials" when they were first broadcast I believe as summer filler in the 70s. They were sort of like a mini-revival in spirit of the 60s Batman show. I believe Adam West played Batman in it.
One show was just all these various DC Villians running around and hokey fighting and chases with some various DC heroes. The babe that played the Huntress was
hot. She filled out the costume nicely. Hubba.
The second show was a like a Friar's roast with Super-Villains. Mordru was in both, which was odd because this is mid-70's and his only major app in comics by then was his origin in Adv 369/370. His next major app was The Earthwar Saga which was pubbed years later in '78. So the fact that he was on this bizarre show that came outta nowhere was itself doubly bizarre.
I recall seeing some more photos and a writeup on these two shows out on the web, but I don't know if it's still out there. Don't remember the exact title of these shows, but they did "super-heroes" in the titles.
The probably was the first time a Legion originated character ever appeared on TV. And for all I know the next time wasn't until the Superman animated show.
Anybody know of others?