History
While Yellowjacket was running off with the blueprints for new sonic weapons he stole from Horizon Labs, he was secretly being trailed by an ant-sized Ant Man. Spider-Man, noticing them both, accidentally alerted Yellowjacket to Ant-Man's presence. He zapped both heroes, which resulted in Ant Man's tech malfunctioning and both Ant Man and Spider-Man getting shrunk to and stuck at miniscule size. Eventually, sometime later, the malfunctioning Ant Man's tech altered the heroes' size again, turning them into giants. In their giant form, they easily defeated Yellowjacket and retrieved the blueprints.[1]