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.

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.

After a crippling betrayal, the team scrambles to reclaim the Mortal Cup from Valentine before he can create his own army.

Everyone at The Institute prepares for the wedding of Alec and Lydia. During what should be a time of great celebration for many is far from it as they examine their relationships. Alec's parabatai should be at his side for the event, yet he and Jace are still at odds.

After Valentine's transfer goes awry, Alec fears his leadership will be called into question by his visiting father.