The phrase "stacked cast" refers to a group of actors who are exceptionally talented or famous. It means that the cast of a play, movie, or TV show is filled with incredibly skilled and well-known performers. Full definition
The thing that can't be ignored here though is the incredibly stacked cast. (waytooindie.com)
This is a team that added several veterans during the offseason — Carlos Beltran, Brian McCann, and Josh Reddick among them — to an already stacked cast of stellar young talent. (sbnation.com)
The already stacked cast of Black Panther just got even better, as Marvel revealed on Thursday that The People v. O.J. Simpson and This Is Us star Sterling K. Brown will be appearing in Wakanda as well. (inverse.com)