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! 
This issue collects following issues:
What If? #21
"What If Sub-Mariner Had Married the Invisible Girl? Chapter 1 Decline and Fall!"
"What If Sub-Mariner Had Married the Invisible Girl? Chapter 1 Decline and Fall!"
What If? #22
"What If Dr. Doom Had Become a Hero?"
"What If Dr. Doom Had Become a Hero?"
What If? #23
"What If Hulk's Girlfriend Jarella Had Not Died?"
"What If Hulk's Girlfriend Jarella Had Not Died?"
What If? #24
"What If Gwen Stacy Had Lived?"
"What If Gwen Stacy Had Lived?"
What If? #25
"What If Thor Fought Odin Over Jane Foster?"
"What If Thor Fought Odin Over Jane Foster?"
What If? #26
"What If Captain America Were Elected President?"
"What If Captain America Were Elected President?"