Only Captain Underpants can stop the three evil space aliens who have invaded Jerome Horwitz Elementary School and turned everyone into lunchroom zombie nerds.

Top-secret truth about Captain Underpants -- George and Harold -- Evil space guys -- Fun with science -- Setup -- Mr. Krupp's Krispy Krupcakes -- What happened next -- Here comes the goop! -- Wrath of the cafeteria ladies -- Captain Underpants and the night of the living lunch ladies -- Quittin' time -- Busted! -- Brown baggin' it -- Bottom of this -- He doesn't believe them -- It's too late -- Incredibly graphic violence -- Assault of the equally evil lunchroom Zombie Nerds -- Oh yeah? -- Space slaves -- Big switcheroo -- Great escape -- Deliriously dangerous death-defying Dandelion of Doom -- Incredibly graphic violence -- Twenty-third chapter -- To make a long story short -- Back to normal?.