Katherine remembers the night she gave birth to a baby girl who was immediately taken away; Stefan spreads the news about Katherine's health; Caroline indulges in some scandalous behavior.
The team's Christmas celebration is interrupted by the LAPD when they arrest Mac for terrorism upon locating a body from a building decimated by a bomb Mac built.
The mutants come up with a plan to bring Sentinel Services down. Eclipse turns to an old friend for information, while Lauren and Andy attempt to combine their powers.
Deb is only 24 but faces Jane's looming 32nd birthday, while Kim and Greyson defend a man who created a website for married couples looking to cheat.