So What!, on December 28, 1987, in Providence, Rhode Island at the Civic Center, and ended August 20, 1988, at the Monsters of Rock festival in Donington Park.
[1][2][3] Alongside Savatage, the band served as the opening act for Dio from December 28, 1987, to March 26, 1988.
[1] Megadeth then embarked on a headlining North American tour, supported by Warlock and Sanctuary, who were promoting their debut album Refuge Denied, which was produced by Mustaine; this was followed by a European run that included support from Testament, Nuclear Assault, Flotsam and Jetsam, and Sanctuary.
[1] Megadeth was scheduled to perform on the Monsters of Rock tour, however after one show they were replaced by Testament.
Due to drug problems within the band, they were forced to cancel an Australian tour.