Herzog Zwei is a real-time strategy shoot 'em up hybrid video game developed by Technosoft of the "Thunderforce" series and published by Sega for the Mega Drive/Genesis. This is considered by many to be the birthplace of real-time strategy games, predating even innovative games such as Dune II. It is the sequel to Herzog, hence the name "Herzog Zwei", meaning Duke Two, the first game had you fighting alongside an army, without being able to construct units. In this entry, each player control a plane able to drop units dispensed from a factory which must be protected or destroyed, other bases can be controlled, as map control gives you more gold to spend on units. Your plane can also transforms into a controllable mecha, able to shoot at grounded enemies.