Susan is headed toward a conference in Siberia when her helicopter is shot down for reasons unknown. With her survival in doubt, Reed Richards must abandon his completion of the Cosmic Cube at its most crucial time to confront the Crimson Dynamo. While Reed, Ben and Johnny fight Dynamo, Sue confronts the Red Ghost. After an intense battle, which includes another four Crimson Dynamo models, they triumph and return to New York, only to find it encased in a box similar to the cube Reed created.

"Contains material originally published in magazine form as Fantastic Four # 47-53"--Cover p. [2].