Doctor Who brought back a trope from the David Tennant era with the return of the chameleon arch.

Here’s where the machine comes from and how it works.

While its possible for the Time Lord to keep going with just one heart, its still uncomfortable.

Doctor Who Season 14 Poster

Audiences know for a fact that John Smith only has one heartbeat, because Joan checks it for him.

However, John Smith never seems to have any complaints.

In fact, why doesnt she give the Doctor a heads-up?

The Tenth Doctor grabbing Jenny as she sets off an explosive in Doctor Who.

Before this, its unknown what the Doctors iconic ship is referred to on his home planet.

However, the Gallifreyan version of Clara Oswald in The Name of the Doctor suggests otherwise.

Either way, the Time Lord oversteps massively.

The Tenth Doctor, pretending to still be John Smith, in the Family’s ship in the Doctor Who episode “Family of Blood."

The latest Doctor Who series introduces the Fifteenth Doctor, joined by new companion Ruby Sunday.

Jo Martin as Ruth Doctor, David Tennant as Tenth Doctor and Freema Agyeman as Martha in Doctor Who

The Tenth Doctor and Joan in Doctor Who’s The Family of Blood.

Jenna Coleman as Clara in the TARDIS with the Sixth Doctor walking behind her in Doctor Who’s “The Name of the Doctor."

Kate (Jemma Redgrave), Melanie  (Bonnie Langford) and The Doctor (Ncuti Gatwa) talking at UNIT in Doctor Who season 14 episode 7.

Christopher Eccleston’s Doctor Who

Catherine Tate as Donna Noble looking shocked on the phone in the Doctor Who episode “The End of Time Part 1."

Peter Capaldi as 12 smiling at Alex Kingston as River Song in Doctor Who’s “The Husbands of River Song."

Gallifreyan Clara Oswald talking to the first Doctor off-screen in Doctor Who.

The Tenth Doctor staring at a sombre Harriet Jones in Doctor Who’s “The Christmas Invasion."

Headshot Of Ncuti Gatwa In The US premiere of the new season of the Disney+ series Doctor Who

Headshot Of Millie Gibson In The US Premiere Of The New Season Of The Disney+ Series Doctor Who

doctor who 2005

An alien from the planet Gallifrey travels through time and space to explore, solve problems and fight injustice while also making friends with human beings. His spaceship, called TARDIS, resembles a police box, but it is much more than it appears to be.

Headshot Of Jodie Whittaker

Headshot Of Christopher Eccleston

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Doctor Who: Doctor Who is a British sci-fi television series debuting in 1963, following The Doctor, a time-traveling alien Time Lord. The Doctor explores the universe in the TARDIS, accompanied by companions, confronting various adversaries and striving to save civilizations while addressing injustices.

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Doctor Who