Dominic Cooper has confirmed he will be in 'Mamma Mia 2: Here We Go Again'. The 'Preacher' actor played the role of Sky in the hit 2008 musical movie alongside Meryl Streep, 67, Amanda Seyfried, 31, Colin Firth, 56, and Pierce Brosnan, 64, and following the news that a second movie is being made, Cooper has revealed he's returning to the franchise. I am - I'm just in the process of working out which shiny Lycra outfit to wear."