David Suchet was so excited to be part of the next Doctor Who episode that he accepted the role without even reading the script.
The Poirot actor will be playing the part of The Landlord in 'Knock Knock', which airs this weekend, and he spoke about guest-starring on ITV's Lorraine.
"I was so thrilled," he said.
"When my agent rang up and said they'd like you to be in Doctor Who, I said, 'Yes'.
"She said, 'Do you want to read the script first?' I said, 'No, I just want to be in one'."
'Knock Knock' sees Bill (Pearl Mackie) and her friends move into what they think is the perfect house.
But when they start to get creeped out by strange noises and mysterious happenings, the Doctor (Peter Capaldi) gets involved to investigate.
Meanwhile, Suchet admitted that he misses playing Poirot.
"He was a great friend," he said. "When you're playing that sort of man for 25 years and you develop with him, I could take him out now – if I get into his mindset – I could take him out now and spend the whole day looking through his eyes.
"I know everything about him. It's extraordinary."
Doctor Who returns on Saturday (May 6) at 7.20pm on BBC One.
To find out what we thought of the last episode ('Thin Ice'), you can check out the analysis and insight of our full written review, or just watch our video review below:
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