Brave and the Bold, The #53 (1964)

THE CHALLENGE OF THE EXPANDING WORLD A green globe containing a micro world crashes down to Earth into the observatory of Dr Stanton. A tyrant referring to himself as Atilla-5 hypnotizes Stanton into helping him expand their micro world to full size, where it becomes a threat to the Earth. Flash penetrates the planet but he is quickly subdued by Atillas forces. The Atom comes to the Flash's rescue with the assistance of two native members of the micro planet. Once free, Flash compresses the micro planet back to its original size, ending the threat to Earth.