Widely credited with inventing the stoner rock genre, he formed the band in 1968 with guitarist Louis Dambra and bassist Gary Justin. They recorded Kingdom Come in 1970 and followed it in 1971 with their self-titled sequel.

They split in 1976 and Garner resurrected the group for 2006's Sir Lord Baltimore III Raw. Reflecting on the band's lack of commercial success in their early days in 2008, Garner said that people weren't ready for their style of playing in the late 60s.