After Episode 5 of Jensen Ackles' Countdown, Oliveras should come clean about her drug problem and Meachum needs to say he has a brain tumor.

Countdown star Jensen Ackles teases his character mark’s fate in the new action series. Find out what he said here.

In a surprising twist, Countdown's Mark Meachum, played by Jensen Ackles, survives a life-threatening tumor, setting the stage for the show's future.