This is a list of the Happy Tree Friends Internet and TV episodes. There are 5 seasons of the Internet shorts, and 13 episodes of the TV series. Each TV episode is 22 minutes, split into 3 shorter 7 minute episodes. There have also been rumors that a second TV Series season is still in the works, but Ken Pontac says that the TV series is currently off the air due to budget problems. In October 2014, it was announced that there will be a full-length film based on the show. It is planned to be released sometime in the near future.
A majority of the episode names in the Happy Tree Friends series are puns of everyday phrases and/or a play on words. (Example: The phrase "It's been fun knowing ya" was turned into Spin Fun Knowin' Ya)
Many episodes from the Season 1 and 2 internet shorts contain a glitch where an image of another scene from the episode would appear for a split second (usually spoiling a character's injury or death). This was fixed in the TV series and onward, with the last occurrence being in Just Desert.
Starting in From A to Zoo, an episode would usually begin with a tune. At the end of the episode, a distorted version of the same tune would be played in accordance to a usually gory scene. It would usually be the tune played on two different tracks, with one track transposed up a half-step.
As of December 2, 2012, every conglomeration of the TV episodes has been uploaded on YouTube.
Seasons 1 and 2 each contain 27 episodes, though season 3 contains 24 and season 4 contains 9. Thus, Season 4 is currently the shortest internet season and also the shortest to finish, as it lasted less than a year. Season 3 is the internet season that took the longest to finish, as it was 6 years long.
The end credits from season 3 onward are based on the back of The Little Golden Books (see at the picture for a comparison).
Usually, Happy Tree Friends episodes are free, but One Foot in the Grave is the first TV episode to be available for digital download (in full HD) for $1.99. The bonus is that you can also view full storyboards by purchasing it.
Season 3 and Season 4 are currently the only seasons whose respective final episodes don't have two parts.
Lumpy and Sniffles are the only main characters to appear in every season finale so far.
Kenn Navarro has stated that the episode everybody had the most fun making was Season 2's Eye Candy.
Not counting a few Blurbs and Classics Remastered episodes, no new episodes were released during the year of 2015.
Not counting the free releases of the Still Alive episodes, no new episodes (regular or irregular) were released during 2017 and 2018 as well.
On El Rey Network airings during The Mondo Animation Hour, the title cards and character pop-ups are cut out entirely, going straight from the Happy Tree Friends logo to the episode's opening scene. The end credits are also moved and incorporated into The Mondo Animation Hour's own end credits, with the episode's title displayed above the credits.
One Foot in the Grave, and possibly the rest of the TV series, was at least partially produced in 2005.