SEASON FINALE: Last week, when Dexter (Michael C. Hall) learned that Hannah (Yvonne Strahovski) had drugged his sister Debra (Jennifer Carpenter), he gave Debra the evidence to put Hannah behind bars. But their story may not end there – and Dexter, thanks to evidence piling against him, may be headed for prison himself, unless he can do something drastic. Which, for Dexter, isn’t that much of a stretch.