Matt Lucas has joined the cast of 'Doctor Who'.

Matt Lucas

Matt Lucas

The 42-year-old actor - who last appeared in the 2015 Christmas special of the sci-fi series - will reprise his role of King Hydroflax's out-of-control robot bodyguard Nardole for season 10 of 'Doctor Who'.

He joins Peter Capaldi as The Doctor, and newcomer Pearl Mackie, who plays Doctor Who's latest companion and will begin filming next week.

Matt said: "I'm chuffed to bits that Nardole is returning to the TARDIS for some more adventures. I loved acting with Peter and I'm excited to work with Pearl."

Steven Moffat, lead writer and Executive Producer of the BBC show, added: "Delighted and slightly amazed to be welcoming Matt Lucas back on to the TARDIS - and this time it's not just for Christmas, he's sticking around. One of the greatest comedy talents on planet Earth is being unleashed on all of time and space."

'Jekyll & Hyde' and 'Peaky Blinders' actress Stephanie Hyam will also guest star in the new series.

The opening episode of series 10 has been written by Steven Moffat, executive produced by Brian Minchin, produced by Peter Bennett and directed by Lawrence Gough.

'Doctor Who' will return in December 2016 with a Christmas Special, followed by the new series in 2017.