Voltron: Legendary Defender
Five unlikely teenage heroes and their flying robot lions unite to form the megapowerful Voltron and defend the universe from evil.

Season 1 · Episode 3 ·
Return of the Gladiator
Shiro must draw on painful memories from his past when a massive evil robot threatens the peace on Arus, forcing the lions into action.
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Episode 3 of season 1 of Voltron: Legendary Defender: “Return of the Gladiator”. Aired 2016-06-10. Watch it online free on ZapFlix.