Heavy Hitters is a 2005 album of cover songs by the Michael Schenker Group. Originally planned by Schenker as a collection of covers featuring himself and a "revolving all-star cast of guest musicians," the album was labeled and marketed as an MSG album, with the result that Schenker received only a flat fee.In 2007, it was re-released as a Michael Schenker solo album under the title Doctor Doctor: The Kulick Sessions and included 4 additional tracks (1-2 and 13-14). The album was re-issued again in 2011 with the title By Invitation Only by the Store For Music label, including the song "Run to the Hills", which Schenker and McAuley had recorded for the Iron Maiden tribute album Numbers from the Beast.