Reed is thrilled when the Fantastic Four find the location of Atlantis, but things get complicated when its ruler, Prince Namor, wants Sue for his bride.
The Fantastic Four faces a deadly dinosaur stampede when Dr. Noriyaki Ito unintentionally brings the ancient creatures to New York City with his GeoPort.
Mr. Fantastic, Invisible Woman, the Human Torch, and the Thing become unwilling passengers in a hop through space after Mr. Fantastic's attempts to use his Cross-Frequency Modulator to control the villain Street, draws a giant dog from outer space.
The superhero team the Avengers is replaced by Ultron, a computer-controlled defense system that goes stunningly wrong the minute it is put on line, forcing the Avengers back into action.