CBS | 10:00 pm

So, the really big question … will there still be an Earth when this hour is over? In the season finale of the drama series, "The Plot Against America," Grace, Darius and Liam (Jennifer Finnigan, Santiago Cabrera, Charlie Rowe) surely will have a lot on their plates in the crucial moments before an asteroid is expected to collide with our planet. Spoiler alert: There’s been talk of a possible Season 2, which may be challenging to execute if terra firma is gone.