Conversation so far:
How many seasons of Happy Tree Friends are there
A total of five seasons of the Happy Tree Friends have been released: 4 seasons on the internet, and 1 season on television.
Who developed Happy Tree Friends
Happy Tree Friends is developed by Aubrey Ankrum, Rhode Montijo, Kenn Navarro and Warren Graff for Mondo Media.
When did the series Happy Tree Friends start
In 1999, the crew began the Happy Tree Friends with a pilot episode.

Question: When did the series air on television
Self-contained rewrite: When did the Happy Tree Friends air on television