“I don’t know what I’d call Teenage Time Killers, but I do know it’s a supergroup of fucking badass musicians and singers,” Corrosion of Conformity drummer Reed Mullin told Rolling Stone in 2015 of his all-star punk-meets-metal side project. Their first album, Greatest Hits Vol. 1, came out that year.

Now, in the wake of Mullin’s death last month, his core collaborators in Teenage Time Killers — guitarist and co-songwriter Mick Murphy, also of My Ruin, and Foo Fighters studio engineer John Lousteau — have released a series of pro-shot...