Martha Jones is my favourite companion because she saved the world by making people say one word which was doctor. She chose to leave the doctor because her family has been through one year of hell and she laughed at the master before he had the chance to kill her.
Rose went away So the Doctor is blue. Ask Donna, “Where’s the Doctor?” She’ll reply, “Doctor Who?” Sarah Jane, and Martha, And now both the Ponds Had their fun with the Doctor And now they’ve all gone. So ask me again Why the TARDIS is blue: There’s a sad man inside With both hearts torn in two.