He appeared on 7 December 2018 against Mark Jeary and won with a strong 110 points. He then won the last 3 games of the series, and was placed aside for the series finals. He returned to Countdown on 23 January 2019 to continue his run in Series 80, following Championship of Champions XV, and here he wrapped up his unbeaten run, joining the 800 club in the fourth show of the new series.
Whitehurst's aggregate score of 821 points secured him a spot in the Series 80 finals in June as the number 3 seed. In his quarter-final, he took on Steven Turnbull and fell behind fairly early due to the latter's darrenic pair of EARWIGS and HOOLIGAN. However, he then mounted a strong comeback during the third "half" and solved the final six-small numbers round to go into the conundrum with a 1-point advantage, and after neither player unscrambled RINGACHED in the time, he therefore advanced to the semi-finals, where he played against Dinos Sfyris. Whitehurst fought hard in the match until Sfyris eventually pulled away and Whitehurst took his first defeat to date.
In 2021, Whitehurst took part in ZoomDown Series 4, and became the second tetrachamp of the series with a total of 433 points. When he returned for the quarter-finals as the number 1 seed, he unfortunately lost 88 - 99 against fellow Apterite Ronan Higginson, the number 8 seed.
|#||Date||Type||Contestant 1||Score||Contestant 2||Presenters||Guest||Lex||Max|
|6969||7/12/2018||P||Mark Jeary||85 - 110||Brendan Whitehurst||Nick Hewer||Rachel Riley||Nicki Chapman||Susie Dent||126|
|6970||10/12/2018||P||Brendan Whitehurst||96 - 59||James Fenn||Nick Hewer||Rachel Riley||Dan Walker||Susie Dent||133|
|6971||11/12/2018||P||Brendan Whitehurst||104 - 50||Sam Reilly||Nick Hewer||Rachel Riley||Dan Walker||Susie Dent||117|
|6972||12/12/2018||P||Brendan Whitehurst||92 - 83||David Rutherford||Nick Hewer||Rachel Riley||Dan Walker||Susie Dent||124|
|6995||23/01/2019||P||Brendan Whitehurst||104 - 62||Linda Nowotarski||Nick Hewer||Rachel Riley||Suzannah Lipscomb||Susie Dent||127|
|6996||24/01/2019||P||Brendan Whitehurst||107 - 52||Laurence Dunkling||Nick Hewer||Rachel Riley||Suzannah Lipscomb||Susie Dent||137|
|6997||25/01/2019||P||Brendan Whitehurst||112 - 62||Charlotte Aldworth||Nick Hewer||Rachel Riley||Suzannah Lipscomb||Susie Dent||125|
|6998||28/01/2019||P||Brendan Whitehurst||96 - 44||Vittorio Angelone||Nick Hewer||Rachel Riley||Suzannah Lipscomb||Susie Dent||126|
|7103||24/06/2019||QF||Brendan Whitehurst||58 - 57||Steven Turnbull||Nick Hewer||Rachel Riley||Rufus Hound||Susie Dent||146|
|7106||27/06/2019||SF||Dinos Sfyris||103 - 78||Brendan Whitehurst||Nick Hewer||Rachel Riley||Richard Arnold||Susie Dent||123|