Paulino Nunes

Lt. Terry Clayton (guest star Henry Czerny - The Tudors) of the 7th Mass arrives with word that the aliens are on their way to attack the 2nd Mass. Clayton's plan to lead the children to a safe haven while the adults remain behind to fight is met with some resistance from the parents, including Tom.

Harvey and Jessica's relationship is tested when Harvey defends someone from her past. Also, Louis assigns Mike his first solo case, a pro bono that has him itching for a win.

Michael becomes alarmed when he hears Cassandra is in trouble and rushes off to help her. He discovers General Tupelov has accused her of stealing two hundred million dollars and has threatened to kill her unless she returns it. However, when Cassandra's story doesn't add up, Nikita becomes suspicious of what she might be hiding. Meanwhile, Alex receives a very tempting offer from Percy that could give her the resources to eliminate Semak.

With Luke in dire need of help, Jace, Clary and Simon take him to Magnus' lair in hopes of saving his life. Once there, the story of how Valentine came to be evil, and Jocelyn and Luke's past is revealed to Clary in hopes of triggering her memory of what happened to The Mortal Cup.

The Institute and The Clave go on high alert.