2x02: Us vs. Them
2x01: Get Out of Town
1x05: End of the Rope
1x04: Love Hurts
1x03: Crossing Lines
1x02: Who's the Boss?
1x01: School's Out
5x04: The Greater Good
5x03: Pie and Prejudice
5x02: Sticks and Ropes
5x01: The Trinity
4x08: The War Child
4x07: Making History
4x06: Puppy Love
4x04: A Spectre Calls
4x02: Being Human 1955
