Why do understudies make great secret agents?

They're already used to working undercover.

Did You Know?

"Undercover" means both secretly acting as a spy AND literally being the backup performer who covers for the main actor! Theater understudies must be ready to jump into a role at a moment's notice, often with minimal rehearsal time. Some famous actors like Shirley MacLaine and Anthony Hopkins got their big breaks by stepping in as understudies when the lead performer couldn't go on.