First, I know I can send you back to where you came from, and second, Havok... our Havok... may already be there! 
Appearing in "Doorway to Yestermorrow"
Featured Characters:
Supporting Characters:
- The Brute (Hank McCoy) (Main story and flashback)
- Ice-Man (Bobbie Drake) (Main story and flashback)
Antagonists:
- Loki (Only in flashback)
Other Characters:
- Havok (Alex Summers of Earth-1298) (Mentioned)
Locations:
- Earth-1298
- New York
- Bannerman Castle
- The Brute's Lab
- Bannerman Castle
- The Negative Zone
- New York
Synopsis for "Doorway to Yestermorrow"
With his intellect back, Hank attempts to gain access to his old lab, only to find that he has made it especially challenging so that only he could crack the code.
Once inside, he begins to remember the experiment which caused him to lose his intellect in the first place, and he later finds that the explosion which made him stupid happened because the Earth-1298 Havok was interfering while he was trying to cure Ice-Man!
It also comes out that Hank discovered the Negative Zone in the Mutant X Universe, and through this discovery, he can send Havok back to Earth-616.