Spies are the perfect TV heroes (or anti-heroes): living double lives, juggling secrets, dodging danger, and constantly wondering who to trust. Great spy shows don’t just deliver gadgets and shootouts; they serve lies, betrayal, shifting loyalties, and moral grey zones wrapped in tension, glamour, or gritty realism. Here are 20 of the best spy and espionage-themed shows ever, from slick modern thrillers to Cold War dramas and satirical takes.