The humans and the Covenant find the first Hula-hoop, Master Chief and Cortana have to discover more about Alpha Hula-hoop before the Covenant learn how to fire it, the Covenant release AIDS, Master Chief meets 343 Guilty Spark and yadda yadda yadda. Will I ever shut up about Alpha Hula-hoop? Let's just get to the point, Master Chief blows up Alpha Hula-hoop. Period.