The battle to the finish with Mole Man! And with Mole Man’s marriage on the line, this fight’s sure to be heated. Will the FF become prisoners in Subterranea?

Reed, Jonny and Sue are searching for the Thing, who went down into the caves of the Moleman to find a cure for Alicia's blindness. However, the Moleman has captured, muted him, and changed his 'aura' in such a way that he looks like a monster to every other human. When the FF rescue squad finds this 'monster' in the caverns, they almost kill him. After finding out that they have been tricked, the complete FF go after the Moleman (even though they are severely wounded) to prevent him from laying waste over the surface land. In the end, they receive help from an unexpected ally...