The Shepperd-Fox website states that actor Rob Cavazos: "shortly flies to Spain to play Walter in the new series of 'DOCTOR WHO'".
Cavazos is best known for his work in the theatre, but also featured in the Channel 4 documentary Munich: Mossad's Revenge.
Production on the new series of Doctor Who is due to begin on Monday 20th February with Matt Smith, Karen Gillan and Arthur Darvill along with director Saul Metzstein.
Since Doctor Who returned in 2005, the production team have filmed in a series of international locations including New York, Italy, Dubai, Croatia and Utah.
The 1985 serial The Two Doctors was shot on location in Seville, Spain.
Doctor Who will return to BBC One in the Autumn.