Benedict Cumberbatch as Thomas Edison

Michael Shannon as George Westinghouse

Nicholas Hoult as Nikola Tesla

Katherine Waterston as Marguerite Westinghouse

Tom Holland as Samuel Insull

Matthew Macfadyen as J.P. Morgan

Tuppence Middleton as Mary Edison

Stanley Townsend as Franklin Pope

Damien Molony as Bourke Cockran

Conor MacNeill as William Kemmler

Celyn Jones as Sherman Quincy

Craig Roberts as Robert Lane

Harry Melling as Benjamin Vale

Colin Stinton as Daniel Burnham

Oliver Powell as Leo

John Schwab as Rudolph Young

Abigail Johns as Emily Faulk

Tom Bell as Reverend Vincent

Tom Sweet as Boy

Iain McKee as Reporter

Jason Matthewson as Stock Broker

Woody Norman as Dash Edison

Louis Ashbourne Serkis as Older Dash

Faye Ormston as Party Guest

Phil Hodges as City Gent

Ekow Quartey as Journalist 1

Adam Lazarus as Wabco Worker

Simon Connolly as Sioux City

Joseph Balderrama as Horace Kaden

Steven I. Dillard as NYSE member

Martyn Mayger as Lawyer

Toby Williams as Fort Worth Investment Banker

Tim Steed as Maurice Manesburg

Christopher McMullen as New York Stockbroker

Jeremy Oliver as Mr. Westinghouse's Secretary

Liza Ross as Beti

Steve Carroll as Cinema Goer

James Chalmers as South Dakota Delegate

Nancy Crane as Gladys

Will Irvine as Reporter 1

Adam Pearce as New Orleans Investment Banker

Sophia Ally as Dotty Edison

Kevin Millington as Henry Walsh

Ben Mars as Francis Upton

Greg Haiste as South Dakota Delegate

Katy Poulter as Hannah

Jed Aukin as Westinghouse Secretary

John Kinory as Scientist

Michael Yates as Stock Enchange Gent

Andy Cockell as City Gent

Giacomo Joshua Brunelli as WABCO Worker

Nigel Wilcock as J.P. Morgan Lawyer

Jay William Whittington Barrette as Wabco Worker

Thor Janke as Policeman

Andrew Okello as Footman

David Morley Hale as Frederick Worthington

Pamela Betsy Cooper as Hotel Guest (uncredited)

Simon Manyonda as Lewis Latimer

John Pierce Jones as President Glover Cleveland

Nigel Whitmey as Doctor Grandoff

Benjamin Schnau as George Westinghouse's Secretary (uncredited)