[s5e11] The Lodger -

: He constantly tries to help Craig confess his feelings for Sophie. The Mystery Upstairs

The Doctor discovers that the disturbance is linked to the top floor of a house, but he can't investigate it directly without being noticed. He decides to rent a room on the ground floor from , a shy office worker who is secretly in love with his best friend, Sophie. [S5E11] The Lodger

: He joins Craig’s local football team and unexpectedly becomes the star player. : He constantly tries to help Craig confess

: Sophie realizes she loves him too, and their combined emotional "staying power" overloads the ship’s systems. : He joins Craig’s local football team and

The situation reaches a breaking point when Sophie is lured upstairs by the ship. To save her, the Doctor and Craig rush to the top floor. The Doctor explains that the ship needs a pilot with a strong desire to be somewhere else. Sophie, who has been dreaming of traveling the world, is the perfect candidate—but the process will kill her.

The Doctor eventually realizes that the "upstairs flat" doesn't actually exist; it is a that crashed on Earth. The ship is automated and trying to find a pilot to fly it home, but because humans are biologically incompatible, the ship’s engines burn them up every time they try to take the controls. The Resolution