Jodie Whittaker pretended to forget her lines during Mandip Gill's 'Doctor Who' audition.

Jodie Whittaker

Jodie Whittaker

The 37-year-old star - who had been cast as the titular Time Lord by this point - wanted to make the actress feel more comfortable as she was trying out for a role in the BBC sci-fi series, to help get rid of any nerves.

Speaking to Radio Times magazine, Mandip said: "I didn't think it came across like that... [laughs] The great thing was, you didn't know your lines!"

Jodie admitted: "I did that on purpose."

Mandip, 32, didn't realise her co-star was helping her out during the audition, but said it had the desired effect.

She added: "Really? Thanks, because it made me feel at ease."

Jodie explained: "It's so intimidating when the other actor knows all their lines, but there's meant to be room for playing and having fun.

"I knew you'd be more comfortable if I wasn't overly prepared."

Tosin Cole - who plays Ryan alongside Mandip's Yaz and Bradley Walsh's Graham - revealed his first impressions of his co-stars, and he joked 'The Chase' host is "the most unstable" when it comes to his moods during filming.

He said: "Jodie's the most consistent because she's always quite high-energy, isn't she?

"Showbiz [Tosin's nickname for Bradley] is up and down - one minute he's grumpy, one minute he's pranking, or he's grumpy and he's pranking. You never know with Brad - he's the most unstable."

Showrunner Chris Chibnall recently hinted the next series - which will feature Jodie as the Doctor - will be back in 2021.

He teased: "We have very big, ambitious plans for our third series together ... it will be next year sometime, hopefully, unless my holiday goes on for a really long time, which is always tempting."