True Believers: Fantastic Four - Marvel Two-in-One #1

Synopsis

The Thing is cooling his heels in the New Mexico desert when he decides to head to Florida and take on the Man-Thing for appropriating his name. In an alternate dimension, the Molecule Man has duplicated himself and his "son" decides to take vengeance on the Fantastic Four when his "father" dies. Instead of arriving in New York, Molecule Man finds himself in the Florida Swamp where Thing and Man-Thing are able to separate the villain from his power staff and reduce him to dust.