Riverdale High Puts on 'Heathers: The Musical' on Tonight's 'Riverdale'

Cheryl (Madelaine Petsch) doesn’t look too thrilled with Toni (Vanessa Morgan) in this new still from tonight’s Riverdale.

In “Chapter Fifty-One: BIG FUN”, as rehearsals for this year’s musical “Heathers: The Musical” get underway, Cheryl, as queen bee Heather Chandler, channels her own HBIC to deal with a recent fallout. Meanwhile, Betty (Lili Reinhart) grows increasingly annoyed by Evelyn’s (Zoe De Grand’Maison) involvement with the musical – as well as the lives of her friends.

Elsewhere, Veronica (Camila Mendes) learns some devastating news about her family, and Archie (KJ Apa) and Josie (Ashleigh Murray) make a decision about their future; and Jughead (Cole Sprouse) makes a surprising move against Gladys (Gina Gershon).

Riverdale airs TONIGHT, March 20th @ 8PM ET/PT on The CW.