The Heroes are having a party when suddenly Avengers Tower comes under Ultron attack from the inside! Evil Ultron Mark 1 has assembled himself in the lab and is exploding out the windows. Help Iron Man and Thor to defeat Ultron Mark 1 and the 2 Iron Legion accomplices under his control. Make plans in the JARVIS control room and treat injured Super Heroes in the sick bay. An Iron Legion is blasting out the doors and windows of the ground-floor robot bay. The other has stolen the Loki Scepter fromthe analysis lab so pursue him with Thor and take aim from the roof of the tower with the secret hidden drone and stud shooters. You must retrieve the Scepter and stop Ultron Mark 1! Includes 5 minifigures with a weapon and assorted accessories: Ultron Mark 1, 2 Iron Legions, Iron Man and Thor.