WCW vs. nWo: 9 Underground is a ROM hack of WCW vs. nWo - World Tour, created by RagDas. In his own words:

Here's my second ROM hack of WCW vs. nWo: World Tour, titled "WCW vs. nWo: 9 Underground". This time around, it's quite simple to summarize what was achieved: 9 wrestlers, as the name suggests, have been added to the playable roster without removing anyone from the existing roster. It is known among a few people who have explored ROM hacking World Tour that the moveset and params data for entire playable roster of VPW64 is contained within World Tour, though for characters that didn't make the final roster of World Tour, their movesets are in various states of completion. This hack has taken 9 of these incomplete characters and given them full functionality, though there are caveats that we'll get into in the next sections.
The big caveat, that I will attempt to repeat at least one more time in this README, is that while this is a ROM hack, it does *not* run on console. Due to the highly experimental nature of what was done, this possibility was always there, but that's the price to be paid when trying something for the first time. Please DO NOT buy this on a cartridge, you will literally be throwing your money away. That's true for other ROM hacks, but especially true for this one. Consider that your only warning (aside from the literal opening screen of the hack) with regard to that particular consideration.
That aside, as always, no real theme to the hack. Main focus here is that we learned how to add new characters without removing any characters, and some other discoveries were made in VPW64 that I saw fit to backport (side port? laterally port?) into World Tour.

Features

Continuing from RagDas' readme:

62 animations were imported from VPW64 to accommodate the following:

New Characters

Here's who I added, and which stable they're in:
  1. Andy the Gigant (Andre the Giant) - WCW
  2. Chono (Masahiro Chono) - nWo
  3. Bad Blood (Great Muta) - nWo
  4. Danny Fang Jr. (Dory Funk Jr. ) - DoA
  5. Major Tom (Terry Funk) - DoA
  6. Abispa (Jushin Thunder Liger) - IU
  7. Le Masquerade (Mil Mascaras) - IU
  8. Dosquerade (Dos Caras) - IU
  9. The Discloser (The Destroyer) - WWW

Caveats

More words from RagDas:

Here's a list of things you should know about what I chose to do that you may disagree with/should read to understand why I made the decisions I made:

Some characters were swapped out for others. Here's a list of the replacements:

For more information, please check the included README file.


Downloads


Patching

The patch for this ROM hack is in .xdelta format, and expects to be patched on an unmodified WCW vs. nWo - World Tour ROM, NTSC-U v1.1 (or "Revision A") in Z64 format.

Patching instructions are similar to what you'd do for VPW2 freem Edition, SUMMIT, or WCW/nWo REVENJI.

Base ROM Information

Information on the unpatched, unmodified World Tour NTSC-U v1.1/Revision A ROM in Z64 format:

Patched ROM Information

ROM information after patching with La Fin Du Tour: