Jonathan will be joining Golden Globe and Emmy Award-winning actress Jane Seymour, BAFTA winner Jessica Hynes and Da Vinci's Demons actor Shaun Parkes in Hooten & The Lady, which is set to air later this year.
Filming has already started on the Sky 1 and Red Planet Pictures' action adventure drama.
As previously announced, Michael Landes and Ophelia Lovibond will play title characters Hooten and Lady Alexandra Lindo-Parker.
Jane, who will play Lady Tabitha Lindo-Parker, the fun and daring mother of Lady Alexandra, said: "The role of Lady Tabitha is a great part to sink my teeth into – she's not your average society woman, and has a keen sense of fun and effortless charm. She would certainly be first on the invite list to any dinner party!"
The eight-part series follows adventurer Hooten, who teams up with Lady Alexandra from the British Museum to track down lost treasures.
Each hour-long episode follows the duo on epic new adventures through jungles, deserts and underground cities.
Sky 1 Director Adam MacDonald said "Hooten & The Lady is gloriously ambitious and perfectly poised to take its place amongst the impressive line-up for an exciting year ahead of brand-new drama and comedy for Sky."
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