No there is not
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I'm not sure what you mean by "episode". If you are referring to WolfQuest 3, there is no release date. They don't have enough funding to even fix glitches for 2.5, let alone make an entirely new version of the game. If you are referring to WolfQuest 2.5, It is already released and you can download it for free from the website.
WolfQuest is absolutely free. You can download it at the WolfQuest website.
You can not download previous versions of WolfQuest. But, you can download the latest, WolfQuest 2.5! It can be found on WolfQuest's website(wolfquest.org)
To join WolfQuest, you have to make an account, fax your information and then mail it to the poeple who make wolfquest.
There are currently no plans for an episode 3 of WolfQuest.