Jarrod Bowen’s brilliance illuminated Hull’s path to the fifth round in a surprise win over the recent conquerors of Arsenal and Wolves.
Forest started favourites but flopped with a near-full strength side while much-changed Hull fully deserved their win.
Bowen shone brightest of all as the 21-year-old midfielder, a talent on many a radar, rewarded Hull’s hunger to rescue their season.
The former Hereford player scored the first goal and set up Nouha Dicko for the second.