Marvel's Avengers Assemble - Season 2 Episode 13 -

With the power and might of all five Infinity Stones finally in his gauntlet, Thanos plans to wield his power over the Universe while the Avengers make a desperate attempt to stop him. The team is able to rebuild Arsenal and defeat Thanos, but unfortunately, Arsenal gets possessed by the villainous mechanical maniac, Ultron, who uses the little machine's absorbing powers to take the power of the Infinity Gauntlet for himself!!.