Katherine Candel

"YOU SAID IT WAS CALLED THE TORTOISE!"

- Katherine

Katherine Candel is one of the Twelfth Doctor's companions in Doctor Who: Last of the Time Lords. She also appears in U.N.I.T.: Defenders of Earth. She calls the TARDIS "The Tortoise" for some reason.

Biography
Katherine is a smart companion besides the fact that she calls the TARDIS "The Tortoise." She works for U.N.I.T. and once knew the Master and Martha Jones. She also can see the Psychix, a species that most people can't see. Unfortunately, she does not have the ability to smell. She often gets annoyed with the Doctor. She also hates Jammie Dodgers.

Personality and traits
Katherine is an adventurous companion who gets annoyed with the Doctor often. She is also very smart as she knows how to fly the TARDIS.

Behind the scenes
Katherine is played by Katie McGrath. Katherine coincidentally has the same name as the actress who plays her, but her name was not based off the actress'. However, the Master's nickname for Katherine, Katie, is based on her name.