Sera Myu is the coined name for Sailor Moon Musicals.
Currently the musicals are reaching into the 30+ shows. Right now the current one after a 8 year hiatus is La Reconquista ( which is the sticky).
The musicals have gone through plenty of different actors playing the iconic characters we know and love but one of the unique things about the musicals is that it doesn't just follow the story it has some of it's own. It has also introduced new characters that are only featured in the musicals themselves.