In , the story follows the Peregrine Falcon Strike Force as they face a surprise escalation of their long-standing war against General Morden's Rebel Army . The Main Plot
: The game begins with the discovery that General Morden, previously thought defeated, is alive and rebuilding his forces with the help of mysterious new allies. Metal Slug 3 [Xbox Classic]
: The joint forces storm the alien ship, fighting through armies of clones and mutated enemies. After rescuing their captured comrade and General Morden, the team faces the massive alien leader, Rootmars , in a final battle while falling through Earth's atmosphere. Key Story Features In , the story follows the Peregrine Falcon
: Unlike previous entries, this game features multiple routes within its five missions, leading to different enemy encounters (like zombies, giant crabs, or sasquatches) that enrich the world-building. After rescuing their captured comrade and General Morden,
: After defeating Rootmars, the heroes return to Earth. While Morden’s men celebrate their survival, the player character throws their weapon into the ocean, reflecting a weariness with the endless cycle of war.
: After several battles, the heroes confront Morden, only to discover he is actually an alien in disguise . The real Morden has been kidnapped by a race of extraterrestrials known as the Mars People .
: In a dramatic twist, the player's character is abducted and taken to the alien mother ship, the Rugname . This forces the remaining Strike Force members to form an ad hoc alliance with the Rebel Army to launch a rescue mission into space.