Iron Golem

Sergei and his brother Sheffield lived a hard life in the south, both being separated after the age of their teenage years. Sergei, being alone, stumbles into a nice man Herobrine Stephens. They would form a friendship, Sergei making his living protecting Herobrine wherever he went. Iron Golem first appeared in Season 1, Episode 6, when Shadow The Hedgehog as breaking Mario and Luigi Jumpman out of Herobrine's Jail. He was defeated when Shadow used Chaos Control, knocking him a ledge. Iron Golem returned in Season 5 to assemble different bad guys among the world to form Team Destruction.
 * Backstory
 * Season 1
 * Season 5

In Episode 8, Iron Golem decides to help Mario and Luigi Jumpman, after hearing about the Zombie outbreak, caused by Waluigi. However he later regrets this, and turns against them in Episode 11, after they leave him and Herobrine in The Tile Room. Iron Golem returns for the final time in Season 8, Episode 5, at RedMountain to inform Waluigi and Wario to kill Mario, Luigi, and Buck Wylo. After this fails, he attempts to kill them himself in Episode 6, but Luigi stabs him with toothpicks, stunning him. In Episode 9, he is killed when Mario electrocutes him by a wire and water. He is seen for brief Moments in Season 9, Episodes 1 and 2, as flashback showing how he got to be Herobrine's bodyguard.
 * Season 8
 * Season 9