What if Merlin took little Mordred to hide in Arthur's chambers instead of Morgana's? Would Arthur betray his own father in order to help them or would he hand them over to the guards instead? When Merlin bursts through the door and sees Arthur there, he has no idea what the prince will do. But the length to which Arthur is willing to go for Merlin will surprise them both. Set in the episode 1x08 The Beginning of the End.