Avengers Assemble Episode 15 Planet Doom Episode Title:Planet Doom.Episode Description:After a brief argument with his father Odin over his obsession of Midgard, Thor briefly returns to Asgard after Heimdall reports that Midgard has disappeared from his vision. Thor finds the entire planet under the rule of Doctor Doom who has changed the past drastically to ensure that the Avengers team never formed where he healed Tony Stark, made a special suit to keep Bruce Banner safe from gamma radiation upon saving him, and never thawed out Captain America. Thor must team up with this timeline's Defenders to defeat Doctor Doom and undo the time change that Doctor Doom committed.