The Invasion from Within! is the third EP by Tsunami Bomb, released in February 2001.
The Invasion from Within! would be the band's only release on Tomato Head Records but is the label's best-selling album. After this release, the band signed to the larger independent label, Kung Fu Records. The title track was used in Atlus USA's release of the strategy RPG '. The song is noticeably absent in the Japanese audio track. Because only Atlus owned the rights to the song, it is not present in parts of the game such as Disgaea: Afternoon of Darkness and Disgaea 1 Complete, which were not published by Atlus.