Aidan McArdle as Albert Einstein

Andrew Havill as Commander Locker-Lampson

Rachel Barry as Margery Howard

Helena Westerman as Barbara Goodhall

Leo Ashizawa as Katsu Hara

Jay Lewis Mitchell as Young Einstein

Simon Markey as Jacob Epstein

James Musgrave as Walter Adams

Simon Haines as Paul Weyland

Toby Longworth as Reporter

Jonathan Rhodes as Reporter

Gethin Alderman as Walther Nernst

Albert Einstein as Self (archive footage)

Adolf Hitler as Self (archive footage)