A group of Alien Nackles came to Earth to conquer it while disguised as an old man to hide from MAT's whereabouts. Determined to know every weakness about Ultraman Jack, Nackle studied the Ultra in battle to reveal what could be exploited as a weakness. This was done by reviving the monsters, Seagorath and Bemstar to do battle against the Ultra.

Ultraman Jack was more than a match for the two monsters combined and eventually they were both destroyed, but Alien Nackle had all the info he needed on the Ultra. Unleashing his bodyguard monster Black King as a decoy to distract MAT, Alien Nackle stole one of MAT's vehicles to get important information about Ultraman Jack's human host, Hideki Go. Discovered that Go had a love for his girlfriend, Aki Sakata, Nackle kidnapped Aki inside the swiped car and the alien's henchmen held Aki out of the moving car, literally dragging her across the pavement, fatally wounding her. During the confrontation, one of Go's friends, Ken Sakata, was in the area and tried to stop the car, but was run over and killed. Once Go heard the news and arrived at the hospital, he only had enough time to see her die in front of his eyes.