Eminent journalist and broadcaster Sir Trevor McDonald hosts the iconic quiz show.
Acclaimed poet and playwright Lemn Sissay OBE adjudicates the words from Dictionary Corner, and maths prodigy Dr Anne-Marie Imafidon MBE brings her arithmetical expertise to the numbers round.
Award-winning journalist and beer sommelier Marverine Cole joins Lemn in Dictionary Corner.
Countdown airs weekdays at 2:10pm on Channel 4. Black To Front day is Friday 10th September.