The Bubble at the Heart of Time blocked time travel across realities and before and after the time of its formation. The Counsel of Kangs learned of its existence and attempted to manipulate the Avengers to penetrate the bubble and use it as a weapon. Eventually, Reed Richards learned of the bubble's existence, and built a timesled to pierce the bubble. With the help of Iron Man (Tony Stark), Thor, Gladiator of that reality, and the rest of the Fantastic Four, the time bubble was destroyed.