A pair of different-as-can-be twin brothers accidentally bring their favorite video game to life, and must now find a way to work together to defeat it.

In the latest diary of middle-schooler Greg Heffley, he records his attempts to spend his summer vacation sensibly indoors playing video games and watching television, despite his mother's other ideas.

An accidental trip into the underworld sends Pat and Jen on an adventure, but their attempts to flee puts them face-to-face with the most evil villain of all, Evil Jen.

"Steve and his friends are ready to sit on the sidelines of the Spiro T. Agnew Middle school football field. But then they stumble upon an old-school video game controller, and they become convinced it can control sports plays"--

"Kitty is back, this time to ... discover that she does not like video games after all. (Well, maybe just a little)"--

Super Rabbit Boy's present to Moon Girl releases Queen Spooky and her army of ghosts, and Super Rabbit Boy is taken captive--so it is up to the normally evil King Viking (who does not like the competition of the ghost army) and especially his secret weapon, Robo-Rabbit Boy (switched to "Good" mode) to save Animal Town, release Super Rabbit Boy, and contain the ghosts.