Slayer found themselves joined onstage by Behemoth's Nergal this week during their performance of early cut "Evil Has No Boundaries" at a concert in Poland. The tune—performed as part of Slayer's ongoing farewell tour at Arena Gliwice on Tuesday, June 4—hails from the rockers' classic 1983 debut, Show No Mercy.

It's a familiar metal duet between the American thrash titans and Polish musician. Concertgoers captured the live collaboration on video, and you can watch one of those clips down toward the bottom of this post.

This isn't the first time Nergal has joined Slayer for a live rendition of the song. Nearly two years ago, the Behemoth frontman filled an identical guest spot at a show in Montana. Sharing that footage online, Nergal explained his history with the track, saying he "must have been 8 or 9 years old … when I heard it on a pirate cassette."

The original album version of "Evil Has No Boundaries" features another guest performer altogether. Former Slayer roadie Gene Hoglan—still to become a drummer for bands such as Dark Angel and Death at the time of Show No Mercy's recording—provided backing vocals on the recording, he said in a 2008 interview.

See Slayer's upcoming tour dates here.

Watch Slayer + Nergal Perform "Evil Has No Boundaries"

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