The 70-year-old 'Blade Runner' actor will have a recurring role as Kingsley, the more evil older brother of King Richard (Timothy Omundson) on the show that debuts in mid-season, reported Deadline.
'Galavant' is a musical fairytale comedy about a knight (Joshua Sasse) taking on the evil King Richard (Omundson) who stole the love of his life from him.
The cast also includes Mallory Jansen, Karen David and Vinnie Jones.
Hauer is best known for his role in acclaimed sci-fi movie 'Blade Runner' and also for his parts in 'The Hitcher', 'Sin City' and 'Confessions of a Dangerous Mind'.