Gateway is one of the most mysterious persons in the mutant universe. Few or none is known of his past until he got rescued from a gang of cyborgs known as the Reavers in Australia by the X-Men. They used him to create gateways between distant places in space, moving like that from their base to any point of the planet (until now, he hasn't showed the ability of opening those gates to another worlds or through time) As the X-Men rested in the former Reavers base, he stayed with them, always sitting in a hill in silence. He helped them with his power, but it seems that he had a bigger scheme in mind and was preparing his players, for he brought Jubilee to the X-Men and was the mentor of the also mysterious M in the past, knowing the truth about her and Emplate.

When Banshee and Emma Frost were chosen by Xavier to teach Generation X, Gateway appeared (apparently due to Emplate's return) in the biosphere, and wanders by the Academy at his will. It was he who brought Penance to the Academy from her prison.

Till now, he has only been seen speaking three times : to Jubilee, Chamber (psyonically) and to the group, as Penance arrived (just one word : 'Penance'). However, he somehow communicates with M.