The Tomorrow People: Season 1, Episode 4

1 - 4: Kill or Be Killed

When Ultra's most wanted, Killian McCrane (guest star Jason Dohring), resurfaces after years of being in hiding, Stephen enlists John's help in tracking him down. John reluctantly agrees to help, but changes his mind when he learns that Killian isn't after Jedikiah as everyone suspects. Stephen, wants to help, but Cara explains that John's history with Killian, which brings back a flood of memories from John's past, making him do something he never thought he would do again. Meanwhile, Stephen's mom (guest star Sarah Clarke) is suspicious of his whereabouts, putting him in an awkward position.