Night at the MuseumSir Lancelot at your service!

The trailer for the third "Night at the Museum" movie is here, and it features more of the same wacky hijinks that audiences loved about the first two films. Ben Stiller is back as former security guard Larry Daley, who has to save the day night again when the "lives" of his museum figure friends is at stake.

To learn more about how the figures are able to animate, he travels to London, where he meets his sassy security counterpart (Rebel Wilson), Sir Lancelot (Dan Stevens), and a powerful pharaoh (Ben Kingsley).

As with the previous "Night at the Museum" movies, there's quite a bit of toilet humor and cheesy puns. This is also the late Robin Williams's last film.

"Night at the Museum: Secret of the Tomb" also stars Owen Wilson, Steve Coogan, Ricky Gervais, and Crystal the Monkey, and opens in theaters December 19.