Mamma Mia! Here We Go Again is a 2018 jukebox musical romantic comedy film written and directed by Ol Parker, from a story by Parker, Catherine Johnson, and Richard Curtis. It is the sequel to the 2008 film Mamma Mia!, which in turn is based on the 1999 musical of the same name using the music of ABBA. The film features an ensemble cast, including Christine Baranski, Pierce Brosnan, Dominic Cooper, Colin Firth, Andy García, Lily James, Amanda Seyfried, Stellan Skarsgård, Julie Walters, Cher, Meryl Streep, Alexa Davies, Jessica Keenan Wynn, Josh Dylan, Jeremy Irvine, and Hugh Skinner. Both a prequel and a sequel, the plot is set after the events of the previous film, and is intersected with flashbacks to Donna's youth in 1979, with some scenes from the two time periods mirroring each other.

Catherine Johnson is a British playwright, producing works for stage and television. She is best known for her book for the ABBA-inspired musical Mamma Mia! and screenplay for the musical's film adaptation. The film became the highest-grossing British picture of all time in the UK, and the biggest selling UK DVD of all time in January 2009. She also co-wrote the 2018 sequel, Mamma Mia! Here We Go Again.