The Invitation
Episode: 4x01 | Airdate: Feb 23, 2015
Episodes
Only One Can Remain
Episode: 4x02 | Airdate: Mar 2, 2015
Versus
Episode: 4x03 | Airdate: Mar 9, 2015
Ninja Roll
Episode: 4x04 | Airdate: Mar 16, 2015
Spy for a Spy
Episode: 4x05 | Airdate: Mar 23, 2015
Spellbound
Episode: 4x06 | Airdate: Mar 30, 2015
The Forgotten Element
Episode: 4x07 | Airdate: Mar 31, 2015
The Day of the Dragon
Episode: 4x08 | Airdate: Apr 1, 2015
The Greatest Fear of All
Episode: 4x09 | Airdate: Apr 2, 2015
The Corridor of Elders
Episode: 4x10 | Airdate: Apr 3, 2015