Ultimate Fantastic Four (2003) #48

What new Ultimate villain will make their debut in this issue?
Lost in the snowy vastness of Siberia, Reed, Ben and Johnny discover what they never hoped to find --- the
wreckage of Susan Storm's aircraft! Who brought Sue down, and has the Invisible Woman disappeared for good? What does this all have to do with the Crimson Dynamo? Is his arrival coincidence, or part of a much larger, sinister scheme?
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