New casting announced for West End Jersey Boys
The show will celebrate its seventh year in the West End in March
Watson's theatre credits include Fings Ain't Wot They Used T'Be (Theatre Royal, Stratford East), A Chorus Line (London Palladium), Finding Neverland (Curve, Leicester), Matilda (Cambridge Theatre/RSC) and Les Miserables (Queen's Theatre).
Gary will be starring alongside current WhatsOnStage Award nominee Michael Watson as Frankie Valli, Edd Post as Bob Gaudio and Jon Boydon as Tommy DeVito. Sandy Moffat plays the role of Frankie Valli at certain performances.
Also joining the cast on 10 March will be Simon Adkins (the original Bob Crewe in London), Matthew Cutts, Stuart Dawes, Nicky Griffiths, Joseph Peters, Chris Stoddart and Helen Ternent.
They will be joining current cast members Nicola Brazil, Lucinda Gill, Thomas Goodridge, Matthew Hunt, Mark Isherwood, Charlotte Jeffery, Ben Jennings, Matt Thorpe and Ben Wheeler.
Jersey Boys opened in London at the Prince Edward Theatre in 2008 and moved to the Piccadilly Theatre in March 2014.
The musical has now been seen by over 20 million people worldwide, and was recently adapted for the big screen by director Clint Eastwood. The show is also currently touring the UK and Ireland.