Will Arnett and David Harbour Vivien Killilea/Getty Images; Charley Gallay/Getty Images Share on Facebook Share on X Google Preferred Share to Flipboard Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Send an Email Print the Article Post a Comment Logo text Will Arnett has stepped in to replace David Harbour in Tony Gilroy's Behemoth! drama, The Hollywood Reporter has confirmed.