Anti-Christ is gearing up for a big return. There are two scenarios:
1. He will come has an "alien" savior to help us defeat a mass pandemic.
Similar to how Superman was portray in the recent film. Many people will flock to him believing he is the savior or a new deity.
2. He will come as a savior to help us defeat an alien invasion.
But we all know aliens (typical grey and other sorts) are mis-represented demons.