No further details were revealed about Fillion’s appearance, or why he’ll be suited up as his beloved Firefly hero, but the actor has taken to Instagram to share a few more moments from the set as he once again donned his, err, tight pants to become the captain of the Serenity again:

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Which reminds me, if a former Firefly star is making a cameo in something, is it mandatory that they dress up as Mal? Because I’m sensing a theme here.

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[TV Line]