If you thought the Wonder Twins' adopted pet, Gleek, was a handful, how about a whole army of Exorian monkeys, bent on conquest? This episode was edited for the Superman-Batman Adventures compilation series, which aired initially on USA before Time-Warner moved the cartoons to Cartoon Network and its sister channel, Boomerang, where the shorts were restored to their original formats (most of them, anyway). "Invasion of the Gleeks" initially aired in 1980.
Note I said that Gleek was adopted. It was explained in the Super Friends comics that he originally belonged to Ilik, the Laughmaker, which would be an equivalent to our circus clowns. Gleek accompanied Zan & Jayna to Earth (Super Friends 7-9, 1st series), but when Ilik arrived on Earth nearly 2 years later, it was assumed he had come to reclaim Gleek, but he allowed the Twins to keep the monkey. Ilik, in fact, had been sent to summon the Twins and the rest of the SF to Exor to deal with a problem there.
And, as the late Paul Harvey used to say, now you know the rest of the story.