During this period, the drum stool was filled by former Napalm Death drummer Mick Harris, although he left soon afterward to form Scorn and was replaced by Tony "Stick" Dickens (of crust band Doom). Bassist Clay was replaced by Mark Gardener, and this line-up recorded ENT's debut album, "A Holocaust in Your Head", which was later voted number 3 in "Terrorizer"s essential European grindcore albums, who described it as "marrying a thick crust-punk crunch and vitriolic lyrical assault with the newborn, clattering fury of grindcore, 'Holocaust...' followed Napalm's heroic uppercuts and haymakers with a Doc Martin in the goolies." The band undertook a headline tour of both Europe and Japan in support of the album. In 1990, Jones and future ENT guitarist Ali Firouzbakht guested on Raw Noise's "Sound of Destruction" single release, and bassist Gardener was replaced by Peter Nash from the band Doom.