Nathan Fillion's big Firefly tease is a canon animated series with the original actors reprising their roles — but it needs a home

Set between the show and the movie.
IGN

Animated response.

The Simpsons executive producer Matt Selman has said that a recent episode of the long-running animated series that showcased the aftermath of a key character's demise should not be considered canon — ...
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The Simpsons Producer Says Episode Featuring Death of Key Character Is Not Canon, as the Show 'Doesn't Even Have Canon'

The Simpsons executive producer Matt Selman has said that a recent episode of the long-running animated series that showcased the aftermath of a key character's demise should not be considered canon — ...