The "Mega Man Zero" series features Zero as the title character. Set around 100 years after the "X" series, Zero helps a scientist named Ciel fight the human city of Neo Arcadia, during which he destroys Omega - his original body, Dr. Weil, and Copy X, leader of Neo Arcadia, twice. Zero makes an appearance in the "ZX" series as Model Z, who plays a minor supporting role in the plot in the first "ZX" game. In "ZX Advent", Zero plays an even smaller role, only having a few lines throughout the game. Zero's "Mega Man Battle Network" counterpart, Zero.EXE makes an appearance in "Mega Man Network Transmission" as the antagonist of the first half of the game. He later aids Mega Man against the true villain, The "Professor".