The Invader King is the leader of the alien race known as Invaders and the final boss of Metal Slug 6. Little is known about him, but he presumably planned the invasion of Earth, likely with the intent of conquering the planet and let his people feast on the Mars People, who at the time were allied with the Rebel Army. He normally resides in the deph of the underground base of the Invaders, where he stays connected to a nest and keeps spawning new Invaders, which will fill the ranks of his army. When the protagonists and the Rebels reached him and destroyed the cocoon, he engaged them in a fight to the death down a vertical cavern. Eventually, blinded by rage, he lost hold of the walls and crashed on the ground, generating a huge explosion which resulted in his death.

Tier: 9-B to 9-A, higher with Self-Destruction

Classification: Alien, Invader, King of the Invaders

Powers and Abilities: Superhuman physical characteristics, large size (Type 0), natural weaponry (Claws and fangs), energy projection, Danmaku, surface scaling (Able to cling on walls and move nimbly while doing so), limited creation (Can spawn Invaders as long as he is connected to the hive), rage power (After being wounded, he was caught in a fit of rage and enhanced his speed and fire rate), involuntary self-destruction (Generated a large explosion upon crashing on the ground from a great height)

Attack Potency: Wall level to Small Building level (Superior to any weapon of the Invaders, as well as those of the Regular and Rebel Army. Can easily destroy floors made of a thick flesh-like substance. As the strongest of the natural predators of the Mars People, he should be somewhat comparable to Rootmars), higher with Self-Destruction (His explosion left a large crater on the ground)

Speed: Superhuman movement speed (By virtue of sheer size. He can also quickly descend a vertical surface while clinging on the walls) with Supersonic+ to Hypersonic reactions/combat speed (His attacks are a threat to characters like Marco Rossi, who dodged bullets, cannon shells and lasers on foot)

Lifting Strength: At least Class 10 (Superior to both the Japanese Tank Soldiers, who can lift a small tank)

Striking Strength: Unknown

Durability: Small Building level (His head alone can endure dozen of rounds from the protagonists strongest weapons and they didn't even manage to kill him by themselves, instead he died from his own self-destruction. Should be somewhat comparable to Rootmars)

Stamina: Superhuman (Went through a battle with the protagonists, focusing on fighting them while descending a vertical cavern and being riddled by bullets on his face)

Range: Several meters by sheer size and with energy projectiles

Standard Equipment: Claws, Fangs and his natural body armor

Intelligence: Supposedly Above Average (Despite his brutal and animalistic behavior, he remains the leader of a technologically advanced civilization and likely has planned the invasion of Earth)

Weakness: He can't spawn new Invaders if disconnected from his nest. If the armor on his head is destroyed, he gets caught by rage. Apparently a blunt trauma like a fall from a great height causes him to explode.

Notable Attacks and Techniques:

•Spawning: As long as he stays inside his cocoon, the Invader King keeps producing new Invaders.

•Energy Wave: After being released from his cocoon, the Invader King released a wave of energy from his eyes, which destroyed the floor underneath and killed four rebels.

•Energy Projection: The Invader King releases a volley of energy blasts from his mouth. As an alternative, he can fire a single larger mass of energy.

•Eye Beams: The Invader King shoots beams of energy from his eyes.

•Energy Blades: The Invader King's body glows, and then releases a multitude of energy blades.

•Raging Mode: If the shell that covers his head is destroyed, the Invader King will be blinded by rage, enhancing his speed and starting to fire energy blades at a continuous and higher rate.

•Self-Destruction: When crash-landing from a great height, the Invader King generates a huge explosion.