Arnold Vosloo is to appear in the Elementary season finale.
The South African actor - best known for his role in the Mummy film franchise - will play Greek shipping magnate Christos Theophilus in the CBS drama's first season ender, TV Guide reports.
In the two-hour finale, Sherlock Holmes (Jonny Lee Miller) will suspect that Theophilus is in league with villainous mastermind Moriarty.
Moriarty is yet to appear on-screen, though British star Vinnie Jones recently featured as his henchman Sebastian Moran and will return in a future episode.
Arnold Vosloo's previously credits include roles in the GI: Joe movies and TV guest stints on 24, Bones and NCIS.
Game of Thrones actress Natalie Dormer will also star in the Elementary finale as Sherlock's long-lost love Irene Adler.
Elementary airs on CBS in the US and on Sky Living in the UK.
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Watch a clip from Elementary below: