Gigantic is the story of They Might Be Giants, a unique musical group centered on John Flansburgh and John Linnell. We're introduced to the duo's lyrical and melodic craft when, for example, well-known actors recite Giants lyrics, underscoring the dark words often coupled with bright tunes. We also catch a glimpse of the band's ideas about performance from the blend of footage from concerts, television, music videos, and other media. Running through the whole film is a portrayal of the Johns' friendship and ultimately, their view of the world, which we see in interviews with the Giants themselves, their colleagues, and their fans.