Robbie Baldwin has been kept in a containment unit within Forge's bunker after the built up of his kinetic energy over the decades caused him to become a walking nuclear bomb. He was briefly visited by Logan after the former came there for medical attention for Bruce Jr.. Speedball told him there was nothing to worry about and that it was good to see him.
Robbie was let out of his containment after the bunker was attacked by Sabretooth and army of clones created from Creed's DNA. As Speedball made his way to one of the open passageways, Forge yelled to Robbie that there was only one way to end this. So Speedball closed his eyes and jumped from the doorway causing a huge explosion to occur when he hit the ground, killing himself and everyone in the general vicinity.