Conversation so far:
What was the Mercury Theatre?
Breaking with the Federal Theatre Project in 1937, Orson Welles and John Houseman founded their own repertory company, which they called the Mercury Theatre
How did Orson Welles come up with the name Mercury Theatre?
The name Mercury Theatre was inspired by the title of the iconoclastic magazine, The American Mercury.
Who else worked with Orson Welles besides John Houseman?
Orson Welles was executive producer, and the original company included such actors as Joseph Cotten, George Coulouris, Geraldine Fitzgerald, Arlene Francis, Martin Gabel, John Hoyt, and Norman Lloyd.
Was anyone else part of Olson Welles crew besides John Houseman, Joseph Cotte, George Couloris, Geraldine Fitzgerald, Arlene Francis, Martin Gabel, John Hoyt, and Norman Lloyd?
Other actors of the Orson Welles' original Mercury Theatre company included Vincent Price, Stefan Schnabel and Hiram Sherman
When did the Orson Welles' Mercury Theatre first open?
The Mercury Theatre opened November 11, 1937

Question: What play did they first perform?
Self-contained rewrite: What play did the Orson Welles' Mercury Theatre company first perform?