Greg Heffley is headed for big things, but first he has to survive the scariest, most humiliating experience of any kid’s life – middle school! That won’t be easy, considering he’s surrounded by hairy-freckled morons, wedgie-loving bullies and a moldy slice of cheese with nuclear cooties!

Wimpy Greg Heffley, now in seventh grade, thinks he has it all together. He has mastered middle school and gotten rid of the Cheese Touch. However, Greg's older brother, Rodrick, is itching to cut him down to size. He gets the perfect opportunity when their mother tries to force the boys to bond. Rodrick may be Greg's chief tormentor, but he feels his constant pranks are just what his little brother needs to prepare him for life's hard knocks.

It's summertime, and Greg Heffley is looking forward to playing video games and spending time with his friends. However, Greg's dad has other plans: He's decided that some father-son bonding time is in order. Desperate to prevent his dad from ruining summer vacation, Greg pretends he has a job at a ritzy country club. But Greg's plan backfires, leaving him in the middle of embarrassing mishaps and a camping trip gone wrong.

A Heffley family road trip to attend Meemaw's 90th birthday party goes hilariously off course thanks to Greg's newest scheme to get to a video gaming convention.