William Emerson Arnett (/?:r'net/; born May 4, 1970) is a Canadian and American actor and comedian. He is widely known for his roles as Gob Bluth in the Fox/Netflix sitcom Arrested Development (2003-2006, 2013, 2018-2019) and the titular character in the Netflix animated series BoJack Horseman (2014-2020). He has received nominations for seven Primetime Emmy Awards and three Screen Actors Guild Awards.

Arnett was Emmy-nominated for his recurring role as Devon Banks in the NBC sitcom 30 Rock (2007-2013). He starred in the NBC sitcom Up All Night (2011-2012), the CBS sitcom The Millers (2013-2014), and the Netflix mystery series Murderville. He has also starred, co-created, and executive produced the Fox sitcom Running Wilde (2010-2011) and the Netflix comedy-drama series Flaked (2016-2017).

Arnett has acted in films such as Let's Go to Prison (2006), Blades of Glory (2007), Semi-Pro (2008), G-Force (2009), and Teenage Mutant Ninja Turtles (2014). Known for his deep baritone voice, Arnett also took roles in Danny Phantom (2004-2007), Ice Age: The Meltdown (2006), Ratatouille (2007), Horton Hears a Who! (2008), Monsters vs. Aliens (2009), Despicable Me (2010), The Nut Job film franchise (2014-2017), The Lego Movie franchise (2014-2019), Teen Titans Go! To the Movies (2018), Chip 'n Dale: Rescue Rangers (2022), and Twisted Metal (2023-).

Arnett has been Primetime Emmy Award-nominated for Arrested Development, 30 Rock, and BoJack Horseman. Since 2020, he has hosted the Fox reality series Lego Masters. Arnett began co-hosting the comedy podcast SmartLess (2020-) alongside Sean Hayes and Jason Bateman.

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