The Secret Invasion was not long ago. Though it was the biggest success of the Skrull empire EVER, it was still not a success. Many agents died, so the Skrulls picked up the pieces. The dead ones were cloned and informed that they were the originals, more Skrulls, and new plans, were made. In order to overthrow Earth, their heroes would need to be taken out. So the Avengers and half of the X-Men were captured by Wave Alpha, and held hostage. Iron Knight and Shadowcrawler were able to escape. They rallied their troops, which included a new Avengers line-up, and the reserve X-Men.