The trailer for the third and final Night at the Museum instalment is out, and shows the late Robin Williams at his comic best.

The much-loved actor reprises his role as Teddy Roosevelt in director Shawn Levy's Night At The Museum: Secret Of The Tomb, in which the museum characters go to London to recharge the magic that brought them to life.

In the newly released trailer Williams helps co-star Ben Stiller navigate vicious jungle cats and explains what the United States is to a heroic Sir Lancelot.

The movie, due out in December, is Williams' second-last big-screen role, but is the final time the Oscar winner is captured on film - his final character is a voice part alongside Kate Beckinsale in 2015's Absolutely Anything.

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It also stars Owen Wilson, Steve Coogan, Ricky Gervais, Dan Stevens and Ben Kingsley, along with Australian Rebel Wilson.

Watch the trailer for Night At The Museum: Secret Of The Tomb:

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Get ready for the wildest and most adventure-filled Night at the Museum ever as Larry (Ben Stiller) spans the globe, uniting favorite and new characters while embarking on an epic quest to save the magic before it is gone forever.

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- AAP