Maggie Gyllenhaal as The Bell Jar Reader (voice)

Ina Marie Smith as Letters & Journals Reader (voice)

Deborah McBride as Additional Voice (voice)

Willow Nash as Additional Voice (voice)

Charlotte Brokenbrow as Reenactment Performer

Zoe Hickson as Reenactment Performer

Charlie Noakes as Reenactment Performer

Tristine Skyler as Self - Writer

Frieda Hughes as Self - Daughter / Artist

Perry Norton as Self - Schoolmate

Betsy Wallingford as Self - Schoolmate

Karen V. Kukil as Self - Smith College Libraries Curator

Heather Clark as Self - Biographer

Neva Sachar as Self - Former Mademoiselle Magazine Guest Editor

Laurie Glazer as Self - Former Mademoiselle Magazine Guest Editor

J. Melvin Woody as Self - Friend

Janet Rosenberg as Self - Friend

Elinor Klein as Self - Friend

Philip McCurdy as Self - Schoolmate

Sylvia Plath as Self - Writer (voice) (archive footage)

Ted Hughes as Self - Writer (voice) (archive footage)