In 2004, Thin Lizzy worked together again, with Sykes and Gorham bringing in ex-Angel bassist Randy Gregg, and drummer Michael Lee, who had played with Robert Plant and The Cult among others. They toured in North America in both the winter and then the summer as special guests of Deep Purple. This line-up proved temporary however, with Mendoza returning in 2005, and Aldridge returning in 2007. There were no plans for a new album though Thin Lizzy continued to tour. At the London Hammersmith Apollo concert of 13 December 2007, the line-up was Sykes, Gorham, Aldridge and Francesco DiCosmo on bass.