- "CURSE YOU BERKLEY, CURSE YOU!"
- — Zero during Breaking the Bank at Caligula's.
His business is in trouble and losing money, and this is due to his rival and arch-enemy Berkley, who owns a similar company. Zero and Berkley's rivalry began at a science fair, where Zero beat him, which led to Berkley swearing revenge on Zero.
Events of GTA: San Andreas
War against Berkley
Zero later phones Carl, to see if he can help with his business. Carl buys the shop, and then begins to help Zero against Berkley, with shooting down remote control aeroplanes, destroying delivery vans and killing delivery boys, and finally defeating Berkley in a miniature war game. Winning the war game finally forces Berkley to leave San Fierro, allowing both Zero and Carl to make money from the shop.
Zero then lends his expertise to Carl Johnson and Wu Zi Mu as they plan to pull off a heist at Caligula's Palace in Las Venturas. This includes creating devices to stop the power from Sherman Dam, stealing four HPV-1000 police motorcycles and stealing a Leviathan.
Zero also participates in the heist itself, instructing Carl Johnson, Wu Zi Mu and three others around Caligula's Palace. However, prior to the heist, he told Berkley, putting the whole heist at risk. Carl punches him in the face at the Verdant Meadows airstrip, making Zero fall to the ground.
Zero also makes an appearance on the second set of Lonely Hearts, saying that he doesn't want to be a virgin all his life. The host Christy MacIntyre says that she cannot help him and wouldn't even suggest him to a hooker.
- Wear Flowers in Your Hair
- Air Raid (boss)
- Supply Lines... (boss)
- New Model Army (boss)
- Zeroing In
- Dam and Blast
- Cop Wheels
- Up, Up and Away!
- Breaking the Bank at Caligula's
- In the mission "Wear Flowers In Your Hair" Zero will drop remote control charges if killed. The remote control charges are intended to represent the remote control for the RC Raider he was controlling at the time.
- According to what he says in Air Raid, Zero suffers from high blood pressure.
- Zero and his infamously difficult mission Supply Lines... are mentioned on the Kult FM radio station in Grand Theft Auto Online. David Cross, Zero's voice actor, also voices one of the station's DJs, Zachary.