Valin Hess is the main antagonist of "Chapter 15: The Believer", the seventh episode of Season 2 of the 2019 Disney+ Star Wars streaming series The Mandalorian.
He is a former general of the Galactic Empire who used to be Migs Mayfeld's superior before he defected from the Empire to become a mercenary. Unknown to many, Hess is the reason for which Mayfeld renounced his Imperial ties, as he sent him and his division to die unnecessarily by choosing to wipe out the city Valin's forces were attacking because the population was successfully holding it off from them.