In 1987, Lookout! released Green Day's first album "39/Smooth". Green Day recorded two EPs: "Slappy" and "Sweet Children". Lookout! Records released "1,039/Smoothed Out Slappy Hours," an album that had the "39/Smooth," "Slappy," and "1,000 Hours" EPs in it. In late 1990, shortly after the band's first worldwide tour, Sobrante left the band. The Lookouts drummer Tré Cool became a replacement, and then became a permanent replacement because Sobrante did not want to come back. Green Day was on tour for most of 1992 and 1993, and played a lot of shows overseas in Europe. Its second album, "Kerplunk", sold about 50,000 copies in the U.S., which was a lot for the punk band in 1992.