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

The first female US President Sally Sheridan is shot dead by a sniper during her Veterans Day speech. Her assassin narrowly escapes the scene with his life, national security hot on his heels - or so it seems. Three months later, an elderly couple discover the body of a wounded man in a tree, wearing a parachute. The young man cannot remember the slightest thing about his own identity.

The Best Seasons of XIII

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