Fantastic Four (1961) 187-A

"Trouble Times Two!"

After returning from New Salem, the Fantastic Four discover that someone has broken into the Baxter Building, knocked out the Impossible Man and has set a trap for them.

The FF run into Klaw and the Molecule Man, who overpower the FF but it's the Impossible Man to the rescue? He defeats Klaw with his own sound creature and manages to knock the control rod from the Molecule Man's hands.

But as Reed Richards goes to pick up the rod for further study, he becomes possessed by the Molecule Man.

Contains a fan letter from Kurt Busiek.