When Lexi comes out of her cocoon, she's reunited with her family and more powerful than ever.
On Falling Skies Season 4 Episode 7, she makes a choice that devastates her parents and brothers, while making the rest of the 2nd Mass more afraid of her than ever.
Meanwhile, the Overlord who Tom burned is out for revenge and heads towards Chinatown with his own army of Mechs and Skitters. The 2nd Mass prepares for the attack after getting assistance from the Volm.
The 2nd Mass suffers greatly from the attack and will never be the same again.