In October 2005, Symons together with his wife, Elly, competed in and won the 'Celebrity Couples Great Temptation' with Elly answering all the questions in the fast money round during the grand final. He also appeared on the Australian version of "Who Wants to Be a Millionaire?" in 2000 and became the first Australian celebrity to reach the $500,000 question, however he lost $218,000 after answering that Benvenuto Cellini was an architect and not a sculptor, going away with $16,000 for his chosen charity and $16,000 for his home viewer. Despite public/fan outcry that he should have used his last remaining lifeline, the 50:50, Symons maintains he was confident about the answer and wanted to save the lifeline for the final million dollar question. Australia's "A Current Affair" program interviewed him later that week, during which they presented him with his would-be million dollar question, using his still available lifeline, Symons was able to pick the correct answer. He appeared on "Who Wants to Be a Millionaire?" again in February 2021 and won $1,000 after missing his tenth question, this time saying that the word 'entrepeneur' came from the French for 'present yourselves', rather than 'rendezvous'. He also competed in the Network Ten's "Australia's Brainiest Comedian" in November 2005 where he came third. In August 2008, Symons participated on a celebrity edition of "Deal or No Deal", on which he won $4,000 for a home viewer. He was also a regular member of the brains trust on ABC TV's "The Einstein Factor". In 2007, he signed up with Channel Seven and to become a judge on "Australia's Got Talent" along with Dannii Minogue and Tom Burlinson. He remained on the show until 2009 and was replaced by Brian McFadden.