Vocalist Russell Allen's solo debut, entitled "Atomic Soul", was released in the summer of 2005. With this album, Allen took a different musical direction from that seen in his work with Symphony X. It was considered by many—including Allen himself—to be a hard rock album. Also in 2005, he recorded an album called "The Battle" with former Masterplan vocalist Jørn Lande under the moniker "Allen/Lande". The two would later record follow-up albums entitled "The Revenge", released May 11, 2007; "The Showdown", released November 5, 2010; and "The Great Divide", released October 21, 2014.