He's playable with a debug BIOS, apparently. Otherwise you're SOL. Maybe it's a cheat in the Universe Bios, I'll have to check when I get home.
Quoth the FAQ:
http://www.gamefaqs.com/coinop/arcade/game/562641.html
---to face Alfred in a 1 player game:---
1 - Win the first 10 fights in a row with no losses
2 - Score over 750000 by 10th match
3 - connect either five P. Power Supers or seven S. Power Supers
====
Sounds like you need to satisfy all three conditions. The bonus fight occurs where you would normally see the game's ending.