The Left Hand of Eternity is the third and final adventure in a Marvel Super Heroes Advanced Set roleplaying game series featuring extremely high powered characters.

From the back cover:

Some of the most powerful super heroes in the universe have a tall order ahead of them. They have to enter the realm of DEATH itself to rescue GALACTUS, who is a prisoner there.

Rescue GALACTUS?

That's right. And if the super heroes fail, the very universe may come to an end! The Left Hand of Eternity is desgined for cosmically powered super heroes like SILVER SURFER, NOVA, FIRELORD, THOR, and DR. STRANGE—but any character can play.