The Jersey Boys cast does change occasionally, but below you can find the most recent cast list for the main leads in the London production (correct as of May 2012).
Ryan Molloy: Frankie Valli
Playing the lead singer of the band is Ryan Molloy, an accomplished actor who has previously held roles in Jerry Springer: The Opera, On The Town, Taboo, The Blues Brothers Unlimited and Eurobeat. He also has a career as a songwriter and recording artist, having worked with artists such as Sting, The Pussycat Dolls, Trevor Horn and Frankie Goes To Hollywood. His debut album, Human, can be bought through his official website.
Jon Lee: Frankie Valli (for selected performances)
Jon might be a familiar face due to the years he spent as a member of pop group S Club 7, who had hits around the world and their own television series during their 90s heyday. He has also appeared in other television shows including Casualty, Eastenders and a number of wildlife documentaries, and was nominated for a What’s On Stage Award for Best Newcomer in a musical. He plays Frankie Valli for selected performances of Jersey Boys.
Jon Boydon: Tommy DeVito
Taking on the role of band member Tommy DeVito is Jon Boydon, an actor with lots of experience on the stage. In addition to his first roles in fringe theatre, Jon has also had parts in shows including All You Need Is Love!, the touring production of The Rocky Horror Show, Grease, Jesus Christ Superstar and We Will Rock You, where he most recently spent two years.
Eugene McCoy: Nick Massi
Eugene McCoy is the third member of the quarter, playing Nick Massi. Prior to joining Jersey Boys he had roles in a number of productions including the West End versions of Guys and Dolls and Mamma Mia!; he has also performed in theatre around the UK in shows such as Cinderella, Little Shop of Horrors and Oklahoma!.
Matthew Wycliffe: Bob Gaudio
Matthew Wycliffe is currently portraying the final member of the Four Seasons, Bob Gaudio. Since graduating from the Arts Ed in London he has performed in the tour of This is Elvis and the tour and West End production of The Buddy Holly Story, where he had the title role. He has also appeared on various television shows in connection with his theatre roles.