In Leland's first major encounter with the X-men he fought Wolverine. He increased Wolverine's mass so much that he fell through the floor into the basement of the New York headquarters of the Hellfire Club. When Wolverine returned he attacked from above, and Leland reacted the same way sending Wolverine back to the basement. Only this time he fell on top of Leland and they both fell to the basement.

During his second encounter with the X-men he sunk Colossus deep into the ground before Nimrod appeared. The Hellfire Club then teamed with the X-men the fight Nimrod, the mutant hunter from an alternate future. Nimrod sent Sebastian Shaw flying out into space and Leland increased Shaw's mass so that he would wall back to Earth and land on top of Nimrod. This effort caused Leland to have a heart attack and he died.