The Sontarans will feature in the new series of 'Doctor Who'
Jodie Whittaker
The clones - which were first introduced in 1973 - are poised to make a dramatic return to the BBC sci-fi show after a 12-year absence.
A TV source told the Daily Mirror newspaper: "Instead of the blue armour they have worn in more recent series, the Sontarans have returned to a more traditional black and silver look.
"They are still short and exude plenty of menace. Should be fun."
Comedian John Bishop will guest star in the episode, in which the Doctor - played by Jodie Whittaker - will confront the Sontarans for the first time in more than a decade.
John, 54, has recently been seen filming on location alongside actors dressed as the clones.
Chris Chibnall, the showrunner at 'Doctor Who', recently hinted the warriors would return for the series, which is set to air in 2021.
He said last month: "More monsters are coming back."
Jodie recently insisted she still loves playing the Time Lord, and suggested she's keen to continue in the role for the foreseeable future.
The 38-year-old actress became the 13th Doctor - and the first female - back in 2017, and she's relished the experience so far.
She explained: "To even question an end point [of 'Doctor Who'] would be too upsetting.
"I had this idea that fame from 'Doctor Who' would be like that 'Notting Hill' image of Rhys Ifans [when he opens the front door to a horde of paparazzi] and it isn’t. If you bump into a Whovian, it genuinely makes both of your days.
"There’s something emotional, poetic and very humbling about being in the show, because you’re a tiny little jigsaw piece of something that is so precious to so many people."
Tagged in Jodie Whittaker John Bishop