Roman Kemp, with sidekick Sarah Greene, hosts the quiz show where knowledge equals speed. Suraj, Natalie, Matty, Pearl and Cliff race in moving podiums across the studio floor to try to win £5,000.

Maggie Greene (Lauren Cohan ... Her mentor and spy master, Mrs. Reed (Sarah Lancashire), sends Helen’s closest friend in the Black Doves, Sam (Ben Whishaw), to watch her back.

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