Chester, a 22-year-old Zoology student from London, revealed he studies at Aberystwyth University in West Wales – but believed Cardiff was located in Scotland.
During the first question, 56-year-old host Bradley read: "Dundonians are natives of which Scottish city?"
The hopeful answered: "Cardiff?" before a bewildered Bradley announced: "Dundee!"
Fans fumed on social media and questioned the ITV casting team's abilities after letting him on to the show.
One viewer tweeted: "Wtf!?? He went to Uni in Wales but thinks that Cardiff is in Scotland!!? Best cancel the wedding mate and go back to Uni #TheChase #DullAsFk."
The Chase: Bradley Walsh bewildered as ANGRY viewers SLATE contestant
The Chase: Chester answered incorrectly about Scotland
Dundonians are natives of which Scottish city?
"Since when is Cardiff in Scotland? And you studied in Wales lol #TheChase," posted another.
A third said: "Chester you are a disgrace to the good name of all those who have studied at Aberystwyth, past and present! SHAME ON YOU #TheChase."
"How he made it past the Audition Stage is beyond me… #TheChase," pondered a fourth.
It came as fellow contestant Sally, a 60-year-old retired school secretary from Witham spoke to Bradley about her favourite pudding, a squidgy chocolate log.
Get Quotes on Home Insurance
The Chase: Bradley Walsh looked shocked
The Chase: Baffling contestant blunders
Wed, September 28, 2016
The Chase host Bradley Walsh and viewers alike are baffled by these contestant blunders.
1 of 10
Host Bradley Walsh blasts Sarah Willingham on the celebrity edition of the show after she asked him if he had made up a question
Holding back the laughs, Bradley said: "Squidgy chocolate log, it sounds…"
One viewer laughed: "Squidgy chocolate log. Mmm sounds….nice?? Haha #TheChase," before another wrote: "A squiddy chocolate log. Sounds scrummy #gangofchase #thechase."
A third posted:"#thechase #gangofchase squidgy chocolate log? Lets face it we've all done one of them on a boxing day morning."