You are going to Watch Avengers Assemble Episode 20 online free episodes with HQ / high quality. Stream cartoons Avengers Assemble Episode 20 Online All-Father’s Day. Odin comes to the Avengers Tower demanding his son cease his “fun” on Earth and return to Asgard. Thor promises that if he can’t prove the good he does on Earth he’ll return home forever. Of course this proves to be a problem when Mangog arrives on Earth.