From the Superman-Aquaman Hour of Adventure comes this, pardon the pun, short starring the "world's smallest superhero", the Atom. The Tiny Titan (Pat Harrington) battles with some alien bugs in "Invasion of the Beetle-Men":
Pat Harrington is better known to viewers from his star turn as handyman Dwayne Schneider on One Day At A Time during the 70's & early 80's, but before that, he was quite busy doing cartoons, initially as DePatie-Freleng's Inspector, and then signing on with Filmation. He was also heard on Journey to the Center of the Earth, which also bowed in '67, over on ABC. It's too bad only three Atom shorts were made, but they were all gems.