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Isabel
Japanese: Yui Komazuka
English: Liza Ross
Isabel initially appears to be a woman in search of the Super Egg but in reality she is Number 2 of the Three Masons Clan.- Code Name: She is really Number 2 of the the Three Masons Clans. After teaming up with Jimmy/Number 3 to kill Number 1, she takes on the mantle of Number 1.
- Dude Magnet: And how. Lupin, Jimmy, and even Jigen and Goemon express an attraction towards her. In the case of (the first) Big Bad Number 1, this was the direct cause of his downfall and death.
- The Usurper: Becomes the new Number 1 by plotting with Number 3 to kill the old one. Teaming up with Jimmy ends with her literally stabbed in the back and ironically a victim of this trope.
Jimmy
Japanese: Masane Tsukayama
English: Peter Marinker
- Dragon Ascendant: He may not be the leader of Conquer the Universe, but he does more action than his superior.
- Dub Name Change: Is known as Jimmy Cantz in the original Japanese. He was given a Clean Dub Name as "Jimmy Smith".
- Taking You with Me: His final actions in the special are to launch the nukes on American and Soviet soil, and once that fails, blow up the building with everyone in it.
- The Usurper: Becomes the new Number 1 by plotting with Number 2 to kill the old one.
- The Starscream: He literally stabs her in the back after she uses the Super Egg.
Silverman
Japanese: Michio Sakayama
English: Don Fellows
- Big Bad: He is Number 1 for Conquer the Universe.
- Demonic Possession: Does this to Fujiko.
- Disc-One Final Boss: He's killed off just before the finale by Jimmy, never meeting Lupin in person.
- Evil Sorcerer: He manages to conjure a sword from his mouth from a blue-green liquid.
- Evil Old Folks: Extremely ancient and ill-looking, being over 100 years old.
- No Name Given: His name is never said in the dub, only being called "Number 1".
Michael
Japanese: Mayumi Tanaka
English: Susan Sheridan
- Child Prodigy: He took up his hobby as part of his quest to find his mother.
- Missing Mom: It turns out to be Isabel.
- Tagalong Kid: The first of many in the specials.
Ed
Japanese: Kenichi Ogata
English: Colin Bruce
- The Brute: Serves as the leader of Conquer the Universe's executioners.
- Kill It with Fire: Dies from Jigen firing at his chopper's missile, blowing it up.
Rooster
Japanese: Tamio Ōki
English: Bob Sherman
- Small Role, Big Impact: He was the one responsible for hiding the Super Egg from Conquer the Universe.