─ Companion to both the Ninth Doctor & Tenth Doctor.
─ First appearance in "Rose".
─ Last appearance in "Doomsday" and "The End of Time, Part Two" (Guest).
─ Her middle name is Marion.
─ Only Companion to ever look into the heart of the TARDIS.
─ She absorbed the Time Vortex into herself--and lived thanks to the Doctor.
─ She is also known as the Bad Wolf.
─ Portrayed by Billie Piper.