Celebrity Mastermind continued on Monday, and the episode left fans cringing over a "painful" mistake.
The January 12 instalment saw host Clive Myrie welcoming JLS star JB Gill, comedian Susie McCabe, adventurer Lucy Shepherd and media personality Richie Anderson.
Ms Anderson, 38, has selected singer Mel B as his specialist subject, but failed to correctly identify her famous alter-ego.
He was asked by Mr Myrie: "Mel B joined the Spice Girls in 1994 and was usually known by what nickname?"
BBC Mastermind: Richie Anderson answered an 'obvious' question incorrectly
|BBC
Mr Anderson responded: "Abrupt Spice," instead of Mel's famous name, Scary Spice.
After being corrected by the presenter, Mr Anderson put his hands over his mouth, seemingly mortified by the blunder.
The mistake was too much for some viewers to accept, and many of them took to social media to complain about Mr Anderson's apparent lack of Spice Girls knowledge.
One penned on X: "What 'Spice name' was Mel B known as? Richie Anderson: 'Abrupt Spice.' What a moron! #celebritymastermind #mastermind."
BBC Mastermind: Fans branded the episode the 'worst 30 minutes in TV history'
|BBC
A second echoed: "Abrupt Spice! WTAF! Richie Anderson!!! #Celebritymastermind #Mastermind."
"Erm, Richie Anderson's specialist subject is Mel B. He thinks she was known in the Spice Girls as Abrupt Spice. #celebritymastermind," a third added.
Another fumed: "Not enough people talking about this. His specialist subject is 'the iconic' Mel B. Asked the easiest-ball question possible of what her nickname was in the Spice Girls he replies 'Abrupt Spice'. What in God's name has generated that thought? #celebritymastermind #mastermind."
A fifth wrote: "#Mastermind Richie had a couple of really awful questions. Mind you he was c**p at the easy ones too."
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Celebrity Mastermind: Richie Anderson answered 'abrupt Spice' when asked what Mel B's nickname had been
|BBC
Someone else agreed: "It's bl**** painful viewing! #mastermind," while one more complained: "A round on Thatcher (spits) and Richie f***ing Anderson as a 'celebrity.'
"This could be the worst 30 mins in TV history. #celebritymastermind #mastermind." (sic)
Ms Shepherd, who had selected Sir Ranulph Fiennes as her specialist subject, came in fourth place with just seven points.
Mr Anderson and Mr Gill both tied second with 13 points each, while Ms McCabe won the episode with 18 points.
BBC Mastermind: Fans flooded X with complaints
|BBC
Complaints had also dominated last week's episode, with fans criticising the line-up of the Celebrity edition.
The episode saw The Traitors star Alexander Dragonetti, comedian Janine Harouni, golf star Dame Laura Davies and actor Greg McHugh all hoping to be crowned winners.
Just minutes into the episode, many complained that they didn't know who many of the famous faces were.
One asked on X: "Who are these so-called celebrities on Celebrity Mastermind?!" (sic)