We are in the earliest days of the X-Men. Charles and Erik have gathered and trained many mutants to form the team. The heroes travel into space in response to a ghostly call for help from the American President, but there they encounter something far more terrifying than expected. A voice and a huge dark figure. Onslaught. The mission ends in the tragic deaths of many members, and from there the team's mutant battle begins.
A very dark story with a Cold War twist. It's the first step towards something much bigger.
