Rebecca Romijn), aka Una Chin-Riley, assumes the captain's chair when the USS Enterprise falls victim to a contagion that ravages the ship. One by one, the entire ship is incapacitated — except for Number One — who is forced to confront a secret she's been hiding as she races to find a cure.In ET's exclusive sneak peek from the hour, titled «Ghosts of Illyria,» Number One pauses when she enters the Enterprise's main deck and announces to the crew that Captain Pike and Spock are stuck on the surface for the time being.