Every season of Allegiance ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Allegiance!

Alex O'Connor, a young idealistic CIA analyst specializing in Russian affairs, learns a shocking secret and his close-knit, affluent family is about to be split apart when it's revealed that his parents, Mark and Katya, are covert Russian spies deactivated decades ago. But today the Kremlin has re-enlisted them into service as they plan a terrorist operation inside the U.S. border that will bring America to its knees.

The Best Seasons of Allegiance

Every season of Allegiance ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Allegiance!