The Big Bang Theory seems unstoppable this season. Its reruns get higher ratings than original episodes of most programs Its last original episode on December 14 earned a 5.4 adults 18-49 rating. It has gone as high as a 5.7 this season. Tonight, a new episode airs with lighter than usual competition - repeats and an episode of Mobbed on Fox. So, how big will The Big Bang Theory be? Make your guess below.