“Iron Man 3” (PG-13): Thunderous explosions, dizzying falls and much destruction of property figure in this third installment of the – so far – consistently fun films based on the comic book character Tony Stark (Robert Downey Jr.), the rich-as-Midas inventor of the Iron Man robotic warrior suit. Teens will savor the witty mayhem.

The villains now looking to destroy Stark – and the O.S. government – are a scientist gone power mad, Aldrich Killian (Guy Pearce), and his apparent boss, the Mandarin (Ben Kingsley), a creepy terrorist with a ponytail and a penchant for showy television threats. After his near-death experiences in “Iron Man 2” (PG-13, 2010), Stark, with his glowing mini-reactor for a heart, has trouble sleeping. Though in a happy romance with his corporate whiz Pepper Potts (Gwyneth Paltrow), he’s frustrated that the government won’t let him in on efforts to stop the Mandarin, who has already killed many innocents. Scientist Killian has a process that can transform his thugs into indestructible fighters without robotic suits. When injured, their bodies turn molten, then regenerate.

The action is big and bold in 3-D, but the best fun emerges from little smart-alecky scenes between Stark and a kid named Harley (Ty Simpkins) whom he befriends after crash-landing near a small town.

Most of the mayhem, from explosions to fist fights, is thunderous and destructive, but not graphic. A group of people are sucked out of a damaged Air Force One and seem to be falling to their deaths. A key character plunges into a raging fire. Another chugs a lot of beer. There is very little profanity. Tony Stark engages in lots of mildly naughty verbal sexual innuendo. A flashback implies he spends the night with a fellow scientist, Maya (Rebecca Hall).

“The Big Wedding” (R): Under-17s probably won’t want to see it anyway, but just in case, “The Big Wedding,” while a tired and wholly predictable comedy, contains too much bawdy sexuality for most high schoolers.

Robert De Niro and Diane Keaton play a long-divorced couple, Don and Ellie, who see each other again during their adopted son Alejandro’s (Ben Barnes) wedding weekend. Susan Sarandon plays Don’s live-in love Bebe, with whom Don originally cheated, breaking up his and Ellie’s marriage. Alejandro’s biological mother from Colombia (Patricia Rae) is a devout Catholic, so he asks Don and Ellie to pose as if they’re still married. Bebe, though hurt, tries to be a good sport about it. Alejandro’s sister (Ana Ayora) starts to seduce Don and Ellie’s other son Jared (Topher Grace), a doctor who has sworn to remain a virgin till he marries. Then Don and Ellie fall loudly into bed, which hurts Bebe more. Their daughter Lyla the lawyer (Katherine Heigl) arrives with marital woes. The priest, Father Moinighan (Robin Williams) tries to stay above the fray. And Alejandro’s fiancee Missy (Amanda Seyfried) has parents (David Rasche and Christine Ebersole) who only seem normal. It’s occasionally amusing, but mostly just warmed-over fluff from other films.

The film includes brief female nudity, a few explicit sexual situations, strong profanity and sexual slang, and drinking.

“Mud” (PG-13): Eccentric characters, a mysterious stranger, a wide river, a boat stuck in a tree, and two unsupervised 14-year-olds who get caught in the middle of it all – that’s a recipe for thrills in this mature-themed but teen-worthy, Mark Twain-esque adventure.

The film’s climax features a lethal shoot-out, though none of the deaths is depicted graphically. One child sustains a life-threatening snakebite. The boys use the S-word a lot, and the script includes some crude sexual slang and references to “doin’ it.” An angry young woman complains about something – never described – that another character’s uncle wanted to do in the bedroom. Characters smoke and drink.