Waldemar Sorychta — former GRIP INC. guitarist who has produced a number of acclaimed albums from SODOM, MOONSPELL and TIAMAT, among others — joined New Jersey thrashers OVERKILL on stage last night (Sunday, August 13) at Zeche in Bochum, Germany to perform the OVERKILL classic “In Union We Stand”. Fan-filmed video footage of his appearance can be seen below.Waldemar played guitar for OVERKILL for three shows on the band’s fall 2016 European headlining tour after regular OVERKILL guitarist Dave Linsk was unable to make the dates. OVERKILL‘s latest album, “The Grinding Wheel”, was released on February 10 via Nuclear Blast. The disc was produced by OVERKILL and mixed by Andy Sneap (MEGADETH, EXODUS, ACCEPT). The artwork was created again by Travis Smith (NEVERMORE, OPETH, SOILWORK, DEATH). OVERKILL recently announced the addition of drummer Jason Bittner (SHADOWS FALL, FLOTSAM AND JETSAM) to the group’s ranks. Even though Ron Lipnicki had been part of OVERKILL‘s lineup for more than a decade, the drummer was absent from the band’s last few tours, with OVERKILL‘s longtime drum tech, Eddy Garcia, stepping in to take his place.