King Thales is a character in He-Man and the Masters of the Universe.
King Thales is the noble ruler of the city of Operon and the father of Princess Rhea. When Queen Balina of the neighboring city of Targa kidnapped Rhea to hold her for ransom, Thales himself went to Targa to secure his daughter's safety. He-Man and Garn found his prison cell and confronted Balina personally, then saved Targa from a flood caused by Draca's magical earthquake. Thales was grateful for their heroic deeds, and personally crowned Garn king of Targa.
- King Thales' character model was recolored and used as King Duplis in the She-Ra: Princess of Power episode "The Mines of Mondor."