The pseudonymous figure was a high-profile contact of investigative journalist Nick Davies (David Tennant), who proved integral to setting him on the path to breaking the phone-hacking scandal.
Nick attends a covert meeting with Mr Apollo at a swanky London address, informing viewers in a 'fourth wall' break that "some guesses have been made" as to who they might really be.
Participants of the skit are comedian Harry Hill (dubbed a "bad guess"), TV presenter Konnie Huq, sports journalist Gabby Logan and chat show host Jonathan Ross.
Speaking to RadioTimes.com at the launch of The Hack, producers Joe Williams and Patrick Spence shared how they arranged those rapid fire cameos for the series premiere.
"And so we went about digging and researched to see who might be allies of the drama, and called in a few personal favours here and there – and thankfully, we couldn't have been luckier to get those four. They were terrific."
"Whether that was to do a brief comedy cameo or to play [a major role], everyone has played their part."
He concluded: "I think you'll find that Jonathan Ross and all of the others jumped at the chance to be part of saying, 'something wrong happened here, and this is our way of contributing to that conversation'."
Robert Carlyle, Toby Jones, Katherine Kelly and Eve Myles join Tennant in the main cast, while the supporting line-up includes Steve Pemberton as Rupert Murdoch and Dougray Scott as former Prime Minister Gordon Brown.
No doubt that's what nine seasons of Inside No. 9 will do for you!
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