Entertainment Weekly is taking a closer look at various characters and ideas from Rogue One: A Star Wars Story each week to the lead up of the release of the film. This week’s focus is on the design of K-2SO, played by actor Alan Tudyk.

In the video below, Entertainment Weekly’s Anthony Breznican describes what went into the design of the droid.

“He’s tall, to intimidate people around him” says John Knoll, the executive producer and visual effects supervisor for Rogue One (who also first pitched the idea for the story). “He’s sort of anthropomorphic, in that he’s got two arms, two legs and a head, you know, et cetera… But then Kaytoo has a little bit more sinister aspect in his original design because he starts off as an Imperial enforcer droid.”

About Rogue One:

From Lucasfilm comes the first of the Star Wars standalone films, Rogue One: A Star Wars Story, an all-new epic adventure. In a time of conflict, a group of unlikely heroes band together on a mission to steal the plans to the Death Star, the Empire’s ultimate weapon of destruction. This key event in the Star Wars timeline brings together ordinary people who choose to do extraordinary things, and in doing so, become part of something greater than themselves.

Rogue One: A Star Wars Story is directed by Gareth Edwards and stars Felicity Jones, Diego Luna, Ben Mendelsohn, Donnie Yen, Mads Mikkelsen, Alan Tudyk, Riz Ahmed, with Jiang Wen and Forest Whitaker. Kathleen Kennedy, Allison Shearmur and Simon Emanuel are producing, with John Knoll and Jason McGatlin serving as executive producers. Rogue One: A Star Wars Story opens in U.S. theaters on December 16, 2016.