Found at the end of Base 1. In order to fight it, the player must first destroy the four power cores affixed to the wall, and is also advised to destroy the two multi-cannon turrets protecting the system, although these are not mandatory.
Once all four cores are destroyed, Garmakilma will appear on the topmost panel, moving from side to side while constantly unleashing rings of fire at the player; these can be destroyed by shooting them in midair.
It is advised to take the two defense systems as soon as possible before they have an opportunity to shoot, or stay on the safe spots left between their spreading fire. Weapons which can provide heavy accumulated fire, and a wide range for taking care of oncoming indirect fire, such as the Spread Gun, are recommended.
In Contra: Return, Garmakilma makes its appearance in Stage 2-2. While this version still shoots rings of fire from its eye, these have more variety. The power cores, which were harmless in the original Contra, are now armed with faster, smaller and indestructible energy projectiles. Garmakilma itself shoots larger rings of energy; these are more durable and have homing capabilities; however, it is not required to destroy all the power cores to have Garmakilma activated.