The pontiff's surprise entrance came during a special Jubilee Mass for those who are sick and those who care for the sick.

Mark Millar's Vatican City #1 arrives in stores this Wednesday, as the last remnants of humanity take refuge behind holy walls while vampires lay siege to the sacred city.

The big picture: It marked the 88-year-old pontiff's first public appearance since leaving on March 23 Rome's Gemelli ...