This only works on the Japanese version of the game, and you need the assistance of an arcade operator if using a real arcade machine (the machine must also be set to Free Play). On the "Virtual Audio" screen, hold the Credit Switch (the 1-Player Coin Button, usually the #5 key on emulators), and press the Start button to go to the character selection screen. While still holding the Credit Switch, press the following button combinations at a normal/medium speed. Notes:
If you do the button combination too fast or too slow, it will not work. Also, when you enter the Dr. Doom or Anita code, you'll automatically pick Spider-Man, but as long as you finish entering the code, he will turn into the character you want.
If using MAME, check that the coin lockout options in the Miscellaneous tab of the game's properties is unchecked, otherwise these codes will not work.
Dr. Doom: Medium Kick, Low Punch, Down, Low Kick, Medium Punch
Thanos: Up, Down, Left, Right, Up, Down, Left, Right, Medium Punch
Anita: Alongside Dr. Doom and Thanos, Anita (from the Darkstalkers series) also appears as a hidden playable character with similar conditions as above. The button combination to select her is: Medium Punch, Low Punch, Left, Low Kick, Medium Kick.
She is seemingly very incomplete: her name is not printed under the lifebar, her lifebar portrait looked completely different from other characters, the announcer never says her name, and she does not have her own artwork or win/pre-boss quotes (she uses Thanos' but with a miscolored logo and Juggernaut's victory theme in the win quote screen), but she does have her name when she wins, as well as at the end of an Auto match when it introduces basic combos. In the PlayStation and Sega Saturn ports (also only selectable in the Japanese versions), she was given a proper "VS" screen portrait.
Her special moves use characters from other Capcom fighting games: Akuma (his sprite being from Super Street Fighter II Turbo) and Mei-Ling (Hsien-Ko's sister, also from Darkstalkers). Her only Super, Love For You, does obscene damage and racks up to 99 hits. She doesn't have her own ending; instead, the credits play twice (beforehand, the heroes in the background are turned to normal from statues, so she is considered a hero character).
Much like with Thanos and Dr. Doom, the Continue screen gameplay tips are in Japanese when losing with her, even in non-Japanese regions. Furthermore, forcing her to be used as an AI-controlled fighter will result in her just standing, often walking to the right when the round begins.
Dr. Doom's little name tag is present during his ending on the Japanese sets. For some reason, it's missing in the international sets.
The game is loosely based on the Infinity Gauntlet storyline, with the heroes and villains battling each other for the Infinity Gems. The final boss is Thanos, who steals whatever Gems the player had collected (at that point, all but the sixth gem, Mind) and uses them against the player, but with each gem having a strange, new effect when used by Thanos.
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