Gomera Mosking (天王創魔心ゴメラモスキング, Emperor Demon Evil Heart Gomera Mosking) is the final boss in the original Contra, and the second most recurring boss in the series after the Gunner Wall. It is a gigantic alien heart which is responsible for spawning the countless aliens fought during the games. In the earlier games, it would be fought right after defeating Java, but it would later appear on it's own in later instalments.

Gomera Mosking is for the most part a sitting duck, since it has no means of defending himself. However, it is always surrounded by small cocoons (usually four or six depending on the game) which constantly spit out facehugger-like aliens. The best strategy to take down this boss is to concentrate on destroying the cocoons first, leaving the boss defenseless.