Nathan Fillion will join the cast of “Lemony Snicket’s A Series of Unfortunate Events” in Season 2, TheWrap has learned exclusively.

The “Castle” alum will play Snicket’s brother, while Tony Hale, Sara Rue, Lucy Punch, and Roger Bart have also joined the Season 2 cast.

The show’s producers are expected to announce the new cast additions at a discussion about Season 1 at Netflix FYSee space Friday night.

The small-screen adaptation tells the fictitious tale of Violet (Malina Weissman), Klaus (Louis Hynes) and Sunny (Presley Smith) Baudelaire, who lost their parents in a mysterious fire.

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The unique TV series stars Neil Patrick Harris as their menacing guardian Count Olaf and Patrick Warburton as narrator Snicket. K. Todd Freeman co-stars as the hapless Mr. Poe; Will Arnett and Cobie Smulders also recurred on Season 1, which debuted in January.

“Lemony Snicket” was renewed for Season 2 in March. There is no premiere date for the second installment yet.

Fillion is coming off of an eight-season run on ABC’s “Castle.” He previously appeared on Netflix in an episode of Drew Barrymore comedy “Santa Clarita Diet.” Recently, he also recurred on “Modern Family” and appeared on “Brooklyn Nine-Nine.” He is repped by CAA.