Arthas Menethil is a fictional character who appears in the Warcraft series of video games by Blizzard Entertainment. In the games, he was once an apprentice paladin with promising potential, but later became one of the most powerful and evil beings in the history of Warcraft, as well as one of the most prominent and well-known antagonists in Warcraft lore. The character has received mostly positive critical reception, and is voiced by Justin Gross in Warcraft III and by Patrick Seitz in World of Warcraft.