Ant-Man (Fantastic Four: World's Greatest Heroes)

An old friend of Reeds with the odd ability to talk and control ants to a helmet he designed, Hank Pym and Reed both agreed to a wager to see who could shrink to the smallest size in their shirking experiments.

Reed invited Ant Man over to show him his new Micro world but when The FF started shrinking beyond control, Ant Man and his Ants helped them out and finally allowed them to return to full size so they could continue their geek talking without worrying about shrinking out of existence.