This is a list of the Happy Tree Friends Internet and TV episodes. There are 4 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.
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 is currently the only season whose final episode doesn't have two parts.