<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> This is a list of Happy Tree Friends episodes . So far, there are total of 5 seasons that have been aired (4 on the internet and 1 on TV). In 1999, the crew began the series with two pilot episodes . The very first pilot was named Banjo Frenzy, which featured a blue dinosaur, a sky - blue squirrel, a yellow rabbit and a purple beaver . The second pilot was named Spin Fun Knowin' Ya! and featured later versions of the dinosaur, the rabbit, the squirrel and the beaver and, from that on, the crew began introducing new characters to the show . It quickly became an internet phenomenon featuring millions of visits per episode . The TV series first aired in 2006 . </P> <P> A spin - off called Ka - Pow! debuted on September 2008 . In 2010, after airing fifteen episodes for the third web season, a hiatus began, in which there were only Break shorts airing with a subliminal message at the end of each, which reads "Happy Tree Friends is dead!". This situation concerned many fans because they thought that the series were going to end soon . The writers confirmed that they were playing a joke on the fact that the characters die a lot and made a pun phrase with the word "dead". The hiatus ended on December 8, 2011 and the series returned once again with the fifteenth episode of the third season, which was named "Clause for Concern". </P>

How many seasons of happy tree friends are there