When the members of the original Alice Cooper group parted ways in 1974, Wagner officially teamed up with Alice Cooper and became his principal co-writer, lead guitarist and band director. Together they wrote their first concept album, "Welcome to My Nightmare". Produced by Bob Ezrin, the album was released in 1975. The Nightmare Tour became the largest and longest touring rock show of the time. The live show also featured the dueling lead guitars of Wagner and Hunter in a guitar battle captured in the film of the same name. The film became a and was later released on home video in 1976. The world tour covered more than 120 cities over an eighteen-month period. Wagner continued to co-write songs and play lead guitar on additional Cooper albums, including: "Goes To Hell", "The Alice Cooper Show", "Lace and Whiskey", "From the Inside" (written by the team of Alice Cooper, Dick Wagner and Bernie Taupin), "Zipper Catches Skin", "DaDa" and "Hey Stoopid" among others.