So you can take my name off the roster, take back my number, and take your team and shove it! From now on, where Spider-Man swings-- he swings alone! 
- —Spider-Man
Appearing in "What If... Sub-Mariner Had Married the Invisible Girl? Chapter 1 Decline and Fall!"
Featured Characters:
Supporting Characters:
Adversaries:
- The Super-Skrull (First appearance)
- Lady Dorma (First appearance)
- Warlord Krang (First appearance)
Other Characters:
- The Red Ghost (Only in flashback)
- Mad Thinker (Only in flashback)
- Awesome Android (Only in flashback)
- Doctor Doom (Only in flashback)
- Alicia Masters (Mentioned)
- Secretary General of the United Nations
Locations:
Items:
- Spider-Man's Webshooters
- The Daily Bugle (Newspaper)
- Reed's Cerebra-Helmet
Vehicles:
Synopsis for "What If... Sub-Mariner Had Married the Invisible Girl? Chapter 1 Decline and Fall!"
- Synopsis not yet written
Appearing in "Chapter 2 Two Against Atlantis!"
Featured Characters:
Supporting Characters:
- Warlord Krang
Adversaries:
Other Characters:
Locations:
Items:
- Oxy-Tablets (To breathe underwater)
- Reed's Ultra-Weapon
Vehicles:
Synopsis for "Chapter 2 Two Against Atlantis!"
- Synopsis not yet written
Appearing in "Chapter 3 Harvest of Shame!"
Featured Characters:
- King Namor, the Sub-Mariner
- The Invisible Girl, Queen of Atlantis
- Sue and Namor's Son (unnamed)
Supporting Characters:
- Lady Dorma
- Warlord Krang (Death)
- Sue's Midwives
Adversaries:
Other Characters:
Locations:
Items:
- Oxy-Tablets (To breathe underwater)
- Reed's Ultra-Weapon (Destroyed)
Vehicles:
Synopsis for "Chapter 3 Harvest of Shame!"
Harm the woman I love, Dorma? Hardly Likely! But what's wrong with her? What have done to my Sue?! She's so-- so large!
— Ladies' Man, Reed Richards
Notes
- Continued from What If? #1 and in What If? Vol 2 #35
- Includes an advertisement The Trap featuring Spider-Man for Hostess Twinkies.
- Includes a letters page Why Not?, with sections How About? and The Watcher Knows....