What If? # 21
- Series: What If?
- Issue: 21
- Publisher: Marvel
- Era: Bronze Age
- Published Date: June 1980
- Cover: Gene Colan, Al Milgrom, Irv Watanabe
- Writers: Bill Mantlo,
- Pencil: Gene Colan
- Ink: Al Milgrom, Bob Wiacek
- Appearances: the Fantastic Four [the Human Torch [Johnny Storm], Mr. Fantastic], the Invisible Girl, Namor, the Sub-Mariner
- Additional Notes: Direct
Story 1: "Decline and Fall!; (What If... Sub-Mariner Had Married the Invisible Girl? chapter 1)"
Story 4: "Two Against Atlantis!; (What If... Sub-Mariner Had Married the Invisible Girl? chapter 2)"
Story 5: "Harvest of Shame!; (What If... Sub-Mariner Had Married the Invisible Girl? chapter 3)"
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