Basically:
- Ron Glass passed away.
- the actors are all much older.
- no real story after Serenity

So the new series had to be set within the timeframe of the existing stories.

They're still looking for someone to voice the character played by Ron Glass.


Firefly's Nathan Fillion on Heartbreaking Reason Why Reboot
Isn't Live-Action
-----------------------------------------------------------
Nathan Fillion?addressed a key creative decision surrounding the
long-awaited?Firefly revival?as development on the new project
moves forward. The actor explained why the series is taking a
different format, offering insight into how the?reboot?plans to
approach its return.

Nathan Fillion explains why Firefly reboot will be animated
Nathan Fillion explained the reasoning behind making the Firefly
reboot animated in an interview with Deadline, stating that the
format allows the original story and characters to return within
a specific timeline.

He tied the creative decision to revisiting events before
Serenity while preserving continuity and character presence.
Fillion said, "you know that's a reason why animation is key,
because Ron Glass is no longer with us," directly linking the
format to cast limitations.

The project takes place between the 2002 series and the 2005
film. Alan Tudyk described this period as the "Wash Is Still
Alive Time." Fillion added, "You can't bring back Firefly without
bringing back all of Firefly." He emphasized maintaining the full
ensemble within that earlier timeline.

Fillion clarified that continuing the story after Serenity was not
pursued, stating, "I honestly have no interest. I think Serenity
was our wonderful farewell." He added, "I can't compete with that,"
explaining that revisiting an earlier period allows the return of
characters in a way that aligns with established events. He also
said, "what I can do is go back in time, bring the gang back
together, and give people what they want."

The animated format also enables recasting where necessary while
keeping characters present. Addressing Shepherd Book, Fillion
confirmed, "Absolutely, that's the plan. Yeah, we're bringing back
Shepherd Book for certain." He added, "Ron Glass, unfortunately,
is not available," and noted, "we're looking for a Ron Glass-type,
and it's not going to be Ron Glass."

Fillion tied the decision to animate to practicality and
accessibility. It allows the cast to participate without relocating
or major scheduling changes. It also preserves the original
characters and continuity within the selected timeline.



<https://www.comingsoon.net/tv/news/2110312-firefly-reboot-animated-no-live-action-why-revealed>






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