If you loved Serenity, try Avengers: Age of Ultron
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Joss Whedon, and they both carry the playful mood tag, and they sit in Action / Adventure / Science Fiction territory. If that's the register that drew you to Serenity, the second film will land in a comparable space — through a different lens.
playful
What Avengers: Age of Ultron is
New York City, high-tech lab, whirring machinery. Tony Stark and Bruce Banner team up to create an artificial intelligence program. Joss Whedon ups the action ante in this Marvel behemoth.

