Brie Larson
as
Sidney Gage

Sam Calflin
as
Finnick Odair

Jennifer Lawrence

+

Everyone else
as
their original roles

[NOTE: I didn't know I needed to clarify this because I thought people would at least realize by the end of act one, but I got people like, five chapters away from finishing and are still surprised, THIS ISN'T A FINNICK X OC FANFIC. THEY'RE JUST FRIENDS. THANK YOU.]