Namor has found the Cosmic Cube!! He's going to use it to take over the surface world!!
Oh, don't worry--like most villains back in the day, Namor really had no idea how to properly use the Cube.
Seriously, this is the best he could come up with:
Indeed, a well-timed sting from the Wasp causes Namor to drop the Cube, and...
From Avengers #40 (1967)