|Jafar says: Read my lips and come to grips with the reality!|
While Pit was attempting to reach Medusa's Castle, to finally defeat Medusa, he eventually encounters the Underworld Gatekeeper. It appeared as the castle's last line of defense. Despite giving his best efforts, Pit's couldn't destroy the Gatekeeper due to it's incredibly thick armor. After a long fight, Dark Pit appears right out of nowhere, and delivers a finishing blow to the Underworld Gatekeeper, causing the machine to explode.