It is 11-year-old Greg Heffley's first day of middle school. But when he enters the building for the first time, he appears to be shorter than 95% of all the students in the school. Chirag Gupta, one of the few boys who is smaller than Greg, tells the story about the Cheese Touch, which comes from just one simple thing -- touching a rotten slice of cheese on the basketball court. Despite Greg's plans to be the school's class favorite, they always backfire, and he eventually becomes the least popular student of the school. Throughout his first year in middle school, Greg tries many things, such as scholastic wrestling, joining the Safety Patrol, and even auditioning for the school play of The Wizard of Oz. His friendship with his best friend, Rowley Jefferson, gradually begins to fall apart since the time when something goes wrong during Safety Patrol, when Rowley takes the blame for a mistake Greg makes. But when Greg takes the blame for Rowley's actions of eating the Cheese by order of a group of teenagers, the two reconcile and Greg achieves his dream of being a class favorite with Rowley as the "cutest friends".
- Zachary Gordon - Greg Heffley
- Robert Capron - Rowley Jefferson
- Rachael Harris - Susan Heffley
- Steve Zahn - Frank Heffley
- Devon Bostick - Rodrick Heffley
- Connor and Owen Fielding - Manny Heffley
- Chloë Grace Moretz - Angie Steadman
- Karan Brar - Chirag Gupta
- Grayson Russell - Fregley
- Laine MacNeil - Patty Ferrell
- Alex Ferris - Collin Lee
- Andrew McNee - Coach Malone
- Rob LaBelle - Mr. Winsky
- Kaye Capron (Robert Capron's real-life mother) - Mrs. Jefferson
- Alf Humphreys - Mr. Jefferson
- Jennifer Clement - Mrs. Flint
- Belita Moreno - Mrs. Norton
- Harrison Houde - Darren Walsh
- January 16, 2009: An online casting call for the voice of Greg Heffley was held.
- August 4, 2009: Official cast announced. Film originally slated for a release on April 2, 2010.
- October 16, 2009: Filming ended on this date.
|Format||Country of origin||Date|
|Theatrical trailer||Worldwide||January 21, 2010|
|Original theatrical||USA||March 19, 2010|
|DVD/Blu-ray Disc||USA||August 3, 2010|
|DVD/Blu-ray Disc||Japan||January 7, 2011|
|DVD/Blu-ray Disc||Thailand||February 3, 2011|
|DVD/Blu-ray Disc||UK||February 7, 2011|
|DVD/Blu-ray Disc||South Korea||February 9, 2011|
|DVD/Blu-ray Disc||Taiwan||February 21, 2011|
|DVD/Blu-ray Disc||France||February 23, 2011|
|DVD/Blu-ray Disc||Australia||March 30, 2011|
|On YouTube||Worldwide||August 12, 2013|
Diary of a Wimpy Kid first aired on Cartoon Network as of September 15, 2012. It moved to Nickelodeon beginning on September 1, 2014. Most recently, it aired on TeenNick on March 31, 2016, and on Discovery Family on June 11, 2016.
Home video timeline
- Main article: Home video timeline for the Diary of a Wimpy Kid series
- http://www.diaryofawimpykidmovie.com (January–November 2010)