In the city of Antropolis, a drill for a new underground Metro Line project reveals strange creatures called Jumpers from within the planet that abduct the crew. Hero Factory send in Evo to investigate, which leads to an attack on the city by giant beasts. The Alpha 1 Team is flown in to stop the monsters by building battle machines to combat the beasts. Breez discovers that the monsters communicate with each other, while Stormer and Furno get abducted by the Jumpers. The remaining Heroes build more battle machines to explore the underground tunnel, while reinforcements from Hero Factory take on the Jumpers in the city above. After much exploration, the team arrive in the hive nest and discover their missing teammates hidden in cocoons in the custody of the Queen Mother of the beasts.