The episode of King of Beasts GoLion used to create this episode of Voltron is titled "The Crown Prince of Hell". In that episode, when Prince Imperial Sincline (Prince Lotor in Voltron.) makes his entrance into his father Emperor Diabazaal's (King Zarkon in Voltron.) castle, he has his servants carry in a large tray. On that tray are the severed heads of the leaders whose worlds Sincline conquered in the name of the Galra Empire.