The episode of King of Beasts GoLion used to create this episode of Voltron is titled "Challenge from Space". In that episode Prince Samson (Avok in Voltron.) is transformed into a Deathblack Beastman (Robeast in Voltron.) and fights GoLion (Voltron) but soon refuses to go on fighting. In a rage Prince Imperial Sincline (Prince Lotor in Voltron.) kills the Deathblack Beastman who soon reverts back into Prince Samson. Angered over the murder of his son, Samson's father King Heracles tries to shoot down Sincline's ship, but is killed when Sincline returns fire. Also, Heracles daughter Princess Amue (Romelle in Voltron.) is kidnapped by Sincline. The final scene of this episode is of the GoLion Team (Voltron Force in Voltron.) and Heracles' surviving son Prince Alor (Prince Bandor in Voltron.) standing over the graves of his father and brother and vowing to get his revenge against the Galara Empire for their deaths.