The Threshold

John Benjamin Hickey

Frank Winter

Olivia Williams

Liza Winter

Ashley Zukerman

Charlie Isaacs

Rachel Brosnahan

Abby Isaacs

Harry Lloyd

Paul Crosley

Katja Herbers

Helen Prins

Michael Chernus

Louis "Fritz" Fedowitz

Christopher Denham

Jim Meeks

William L. Petersen

Col. Emmett Darrow

Jason Weiler

Finney

Michael O'Neill

Psychiatrist

Fiona Dourif

Jean Tatlock (voice)

Travis Hammer

O'Byrne

Neve Campbell

Kitty Oppenheimer

Jefferson White

Cole

Daniel London

J. Robert Oppenheimer

Stafford Douglas

Thatcher

Audrey Moore

Francine

Griffin Dunne

Woodrow Lorentzen