Underground is the second studio album by American garage rock band The Electric Prunes, released in 1967 on Reprise Records.

This changed with Underground due to producer Dave Hassinger not being as active in the sessions, resulting in nine of the 12 tracks becoming the band's own material.

[5] The band continued in their utilization of distorted sound effects, fuzz-toned guitar instrumentals, and experimented with a Vox organ.

[7] Underground was released in August 1967 and became a moderate success, charting at number 172 nationally, though without a hit single, the album could not reach more popularity.

This lineup consisting of Tulin, Lowe, Williams, Fortune, and Gannon would tour to promote the album, playing across the US in prestigious venues like The Crystal Ballroom in Portland.