Change is good. The 11th Doctor knows this. That’s why he wears a bowtie now. Bowties are cool. And sure, his regeneration was a little rocky and maybe the TARDIS needed a new desktop theme anyway, but he’s got everything under control. Really. You can stop laughing at any time.

A fellow Time Lord turned rival, the Master is the arch-nemesis of the Doctor on the BBC series Doctor Who. Although the two were friends growing up on their home planet, the Master desired power while the Doctor sought adventure and service. Occasionally the two unite as allies, but always break away as enemies once again. This guide covers the latest incarnation of the Master, nicknamed Missy (Michelle Gomez), encountered primarily by the 12th Doctor. For the hat, buy a plain black one and glue on a few fake flowers and berries.

The endearing, cowardly Nardole (Matt Lucas) was a brief companion of the 12th Doctor on the BBC TV series Doctor Who. Originally an employee of the Doctor’s wife, River Song, Nardole lost his head in an attempt to discover River’s whereabouts but was reassembled by the Doctor. The two joined forces for a short while, and then Nardole made a courageous decision that lead him down a different path. Nardole dresses in a distinctive, goofy outfit of burnt orange coat, beanie and glasses.

Sherlock Holmes’s flatmate and blogger seems harmless enough when you first meet him, but don’t let the frumpy exterior and questionable taste in sweaters fool you. Underneath the plaid and knits is a sharp-eyed ex-soldier and adrenaline junkie who loves the chase almost as much as his partner-in-crime-solving does.

Rose started out as a normal nineteen-year-old shopgirl until the Doctor blew up her shop (there were Autons inside at the time – don’t ask). But given the choice between an ordinary life and adventure through all of time and space, Rose chose the latter. Hey, who wouldn’t?

Peter Capaldi is the 12th incarnation of Doctor Who, accompanied by companion Bill. In the 10th series of Doctor Who, his costume has changed from a navy coat with red lining to a black coat with blue lining.