The veteran actor was spotted filming with new companion Pearl Mackie in Wales.

Poirot star David Suchet joined the cast of Doctor Who in Cardiff this week and was more than happy to pose for a selfie.

The veteran actor is playing The Landlord in an episode written by Doctor Foster writer Mike Bartlett, which is due to air in 2017.

It’s not yet known whether the character will be a friend or an enemy of the Doctor and his new companion Bill, who was also spotted filming in the Pontcanna area of Cardiff on Wednesday.

The new series will see Peter Capaldi and Pearl Mackie unite for their first series of adventures through space and time with Matt Lucas due to reprise his role as the hapless Nardole.

The actor, best known for his role as Agatha Christie’s famous detective, was dressed in a brown suit, with overcoat as filming took place on a sunny afternoon in the leafy suburb.

Pearl Mackie – the Doctor’s new companion – was also spotted filming, but there was no sign of Capaldi.

Steven Moffat will pen the series opener followed by an episode from Frank Cottrell Boyce, who wrote series eight’s tenth instalment, In The Forest of The Night.

Mark Gatiss also joins the team of writers, penning at least one episode of the upcoming series.

Doctor Who returns to BBC1 in December 2016 with a Christmas Special, followed by series 10 in 2017