So much tactical gear!

Shhhhh!

Cillian Murphy has also joined Paramount's sequel, which will see John Krasinski return to write and direct.

Plus, what were Joss Whedon's contributions to the script?

Get a behind-the-scenes look at the iconic episode.

The star of 'Inception' and '28 Days Later' will play a man with mysterious intentions who joins the family unit.

He'll be working off an original screenplay he wrote.

Season 2 is expected to debut sometime this year.

And yet another re-watch ensues.

The co-writer, director, and star also reveals why he changed his mind about making the follow-up.