Leonidas I appears as a playable ancestor in Assassin’s Creed Odyssey.
Odyssey opens with a playable sequence set at the Battle of Thermopylae in 480 BC. The player controls Leonidas I, the historical king of Sparta, during the battle against the invading Persian army. This sequence establishes the ancient family history connected to the game’s later protagonist.
Most of Odyssey follows a mercenary in the fifth century BC, during the Peloponnesian War. Players can choose Kassandra or Alexios for the main role, which is why that character should not be confused with Leonidas. Leonidas is not the game’s continuing protagonist; he appears in the introductory historical section and in story revelations concerning the protagonist’s ancestry.