In "Super Blooper", Atom helps an actor (Allan Melvin) who plays Atom's hero, Super Guy, when the actor comes to town on a promo tour, and has to impress some kids. Atom's only too happy to help.....
I think by this point in the series, Don Messick had taken over as the voice of Atom, replacing Howard Morris. Don't know why.
Anyway, they don't do these kind of promotions anymore, since too much information is out in the public purview.