After the 9th Doctor regenerates, Rose finds herself missing him. A part of her feels like the new Doctor isn't the same man as the last one. She finds herself clenching on to the familiar leather jacket and old memories. She feels abandoned and when the Doctor finds her, he attempts to convince her that he hasn't changed by saying three little words and an unforgettable promise.

John H. Watson, un tranquilo estudiante de medicina conoce a un misterioso joven en la universidad, quien es aparentemente un "genio". Sin darse cuenta, la peculiar personalidad de este extraño lo convertirán en su "obsesión" ¡John ya no puede pensar en nada más! (Teenlock! - Johnlock)