Diary of a Wimpy Kid is a children's book series about a middle school kid named Greg Heffley, and his misadventures with his friends, family, and bullies. As of 2019, they are currently 13 books in the series. The sixth book in the series is named Diary of a Wimpy Kid: Cabin Fever. The plot follows Greg's antics, until about halfway through the book where a snowstorm shuts down the school, and Greg's family has to find a way to stay warm. There have been four live-action films based on the book series, being released from 2010 to 2017, but what is not known to the public eye is that there was planned animated special based on Cabin Fever.
In December 2012, Jeff Kinney was featured at a premire event in the UK. He confirmed that the third live-action film was going to be the last one in the series, but he also announced an animated film based on Cabin Fever. During production, it was stated if the animated film was going to be marketed as a theatrical film or a television special and Jeff Kinney would much rather stick with a television special. Jeff Kinney also stated that there was no longer going to be any more live-action films based on the Diary of a Wimpy Kid series (until the fourth sequel in 2017) and he wanted it to be released as an animated television special on FOX in 2014.
As of 2019, nothing of the project has surfaced. Jeff Kinney has made another live-action film since then, but nothing about the animated special has been announced since 2013.
However, around early 2019, an animated television series based on the books was announced by Fox. It is possible that the elements of the books, specifically elements of Cabin Fever, may make it into the series, which might appear on Disney's upcoming streaming service (due to the acquisition of 20th Century Fox). The television special is probably the closest to the cancelled special.