Contra is a freeware modification for Command and Conquer Generals: Zero Hour real-time strategy game. It's a big project started in 2004. It adds many new units as well as numerous new upgrades, new general's powers and buildings. It also adds new sounds, maps, bug fixes, enhanced graphics, and other effects, as well as three new generals.
Old Nemesis is improved and replaced with this unit. His role is changed too. He is not a battle oriented unit anymore. In fact, he comes with 8 Cylons loaded inside. Thanks to Nemesis N2's great armor, you can transport them anywhere you like.