Mesomorph Enduros is a various artists compilation album released in December 1992 by Big Cat Records.[1] It was assembled by musician and composer J. G. Thirlwell, who had been asked by Big Cat to compile songs by his favorite underground American bands.[2][3] The songs "Room 429", "Johnny Shiv" and "Blister" were recorded and made their debut specifically for the album's release.[4] The album is dedicated to Unsane's former drummer Charlie Ondras, who had died in June.[5]