“The final installment in the Groundhogs’ trio of early ’70s masterpieces features eight epic tracks, so stripped-to-the-bone and brutal they are barely definable as blues. With the classic line-up of the band recording for the last time, the album has some of the heaviest cuts in their oeuvre: “Earth is Not Room Enough” finds a riffy groove dissolving into mellotron-driven confusion; “Death of the Sun” foregrounds frantically layered piano and guitar arpeggios; and the album’s closer, “The Grey Maze,” highlights the devastating guitar work that made Tony McPhee a British legend. Hearing the latter’s fret heroics, one would be hard pressed to disagree with the album’s premise that the Mighty Groundhogs were indeed here to save the world.” - Patrick Sullivan, AllMusic