X-Men #34

Gambit and Psylocke, guided by Sabretooth, infiltrate one of Mr. Sinister's bases where they encounter a Riptide clone. They defeat it and are joined by Beast and Rogue. Inside, they meet Threnody, who reveals details about Sinister's cloning operations and the Marauders. They confront a Sabretooth clone and defeat it before Threnody destroys the base, allowing them to escape.