The broadcaster provided a blurred image of them, along with a code to crack. Each number in the code corresponded to its letter in the alphabet, providing quizzers with the following letters - AADDEINNNTTV - which can be rearranged to make, you guessed it, David Tennant.
Genius Game is an adaptation of the South Korean show of the same name, which sees players with their own unique skills competing against each other in tests of analytical reasoning, attention to detail, memory and loyalty.
The players must form alliances and decide who to trust and who to betray in order to survive, with a cash prize of up to £50,000 up for grabs.
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Katie Rawcliffe, head of entertainment at ITV, said: "This exciting reality format is designed to keep not just the players but the audience on the edge of their seats, with each episode containing compelling gameplay and thrilling twists.
"David Tennant is the perfect ringmaster to preside over this battle of brainpower, teamwork and deception. We’re delighted to be bringing Genius Game to the ITV audience."
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Tennant recently hosted the BAFTA Film Awards, having been seen last year reprising his role on Doctor Who. Meanwhile, he also has the third season of Good Omens coming up.
He made a surprise appearance during the final episode of The Masked Singer this year, too, having admitted that he "love[s]" the show.
Genius Game is coming soon to ITV and ITVX. Looking for something to watch? Check out more of our Entertainment coverage or visit our TV Guide and Streaming Guide to find out what's on.
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