Weekend Movie Trailers and Reviews: Will 'Sherlock' Outwit 'Mission: Impossible?'

The box office needs a serious pick-me-up, as last weekend's yawner with "New Year's Eve" coming out on top lead to the slowest weekend in theaters since 2008. Ouch.

But if there's anything that can uplift a sagging, slumping box office, it's movies with a whole bunch of explosions in them. Robert Downey Jr. and Tom Cruise tend to help, too. And lucky for Hollywood, the movies coming out this weekend have all of those things.

Read on for trailers and reviews for this weekend's big releases...

"Sherlock Holmes: A Game of Shadows"

Rated PG-13, 128 mins.

Robert Downey Jr. and Jude Law are back as Sherlock Holmes and Watson, and considering the success of the first "Holmes" flick, it's hardly any surprise. This time, Holmes is up against Moriarty, who is the Magneto of the Sherlock-verse. That is to say, he's the ultimate baddie.

Guy Richie returns to direct, Rachel McAdams returns to reprise her role, and the always-good Jared Harris joins on as the evil Moriarty.

Rotten Tomatoes has "Sherlock Holmes: A Game of Shadows" at 66% among critics, a number about on par with the reviews for the first movie (which landed at 70%). Critics are noting that the narrative roams a bit too far, which may be an indicator of why the movie runs more than two hours.

See it if: You enjoyed the first one, I suppose... expect much of the same. Also, there's RDJ in a dress.

"Mission: Impossible - Ghost Protocol"

Rated PG-13, 133 mins.

Remember back in the first "Mission: Impossible" when Ethan Hunt was on the "Disavowed" list? Well, now the entire IMF is disavowed, and Ethan and his team must clear their organization's name. Much like in the first movie, Hunt is working as a rogue agent with an undercover team, with just about everyone on his tail.

This time, the team includes Jeremy Renner and Simon Pegg, with some familiar faces like Ving Rhames making apperances. Expect less flipping off of motorcycles and more of the good old-fashioned spy stuff.

Rotten Tomatoes has "Mission: Impossible - Ghost Protocol" at a whopping 94% among critics, with many of them lauding director Brad Bird (who directed Pixar films like "The Incredibles") on his first major live-action effort.

See it if: Come on, you know you want to see Ethan scale that tower in Dubai with sticky gloves!

"Young Adult"

Rated R, 93 mins.

Writer Diablo Cody and director Jason Reitman, who last teamed up for "Juno," bring you this R-rated comedy about a young adult fiction writer, Mavis (Charlize Theron), who ruled her high school and returns home to reclaim her former flame, who is now married. Things prove a little more difficult than she expected, and she winds up bonding with a former classmate (Patton Oswalt), whose high school experience may have been different but nonetheless finds something in common with her.

Rotten Tomatoes has "Young Adult" at 82% among critics. The magic that happened in "Juno" isn't quite there this time, and some might have trouble relating to the caustic Mavis, but there's still enough comedy and bitter, twisted heart to make this one worth a watch.

See it if: You love Patton Oswalt. And who doesn't?