Mary-Kate and Ashley in Action

Mary-Kate and Ashley decide to investigate a sudden disappearance of the world horse population. At first they suspect Oliver Dickens of pulling another master illusion, but when a group of horses they have under surveillance suddenly shrinks before their very eyes, they learn Clive Hedgemorton Smythe is attempting to create his own private pony collection.

Mary-Kate and Ashley are off to Moscow in search of The Butterfly Girls, who've mysteriously gone missing in the "Battle of the Girl Bands,"and must outwit the villainous music producer known as CD and his protege Raven to get the Butterflies back out of their cocoons.

Cheese-whiz Clive Hedgemorton-Smythe causes a worldwide bad hair day which immobilizes everyone on the planet. Mary-Kate and Ashley must join forces with their usual nemesis, Renee La Rouge, who will do anything - even "go good" - to get her hairdo back.

It's off to Las Vegas, where Ivan has been kidnapped during a huge sci-fi convention. Mary-Kate and Ashley must go undercover to rescue Ivan from the high-tech illusion of the Black Hole before the clock strikes midnight and Ivan will be Oliver Dicken's prisoner forever.

Mary-Kate and Ashley head to Mexico, to the site of an ancient Mayan pyramid where archaeologists are being terrorized by the ghost of King Machu Pichu, and expose a heinous plot by Renee La Rouge to plunder the King's tomb in search of the secret of eternal youth.

It's thrills and chills on the De Luxe Express as Mary-Kate and Ashley solve the mystery of the missing Quincy, who's been kidnapped by a master magician-yup, Oliver Dickens again-masquerading as a mysterious princess. Now all they have to do is rescue the imprisoned pooch!

Clive's back, and this time he's kidnapped the charismatic host of a popular nature show. Mary-Kate and Ashley must rescue the TV star from the Cheeseman's clutches while helping Ivan deal with his fear of bugs, and stop Clive from trashing the ecosystem of the Costa Rican rain forest.

In Antarctica, cheesy villain Clive Hedgemorton-Smythe kidnaps Rod, Ivan and Quincy, thinking the girls will "fall apart" without their male friends to help them. But Mary-Kate and Ashley not only rescue their friends but make it home in time to host a dinner party!

Mary-Kate and Ashley enter a vintage plane race when entrants' planes begin mysteriously disappearing, and discover a Bermuda Triangle-style mystery which they can solve only by going down with their plane - leading them to the master of illusion, Oliver Dickens!

On a field trip to the Galapagos Islands, Mary-Kate and Ashley must unravel a mystery involving sea monsters, bubble wrap and fruitcake? But all comes clear when they discover the Shred Squad, up to no good in search of the perfect wave.

When elephants in zoos and animal parks around the world begin to suddenly vanish without a trace, Mary-Kate and Ashley find themselves battling a new and clever adversary, the amazing illusionist - Oliver Dickens.

On vacation in New Orleans with Rod and his cousin Jenna, Mary-Kate and Ashley investigate a series of bizarre ghost sightings and Jenna learns what it really takes to be brave.

Mary-Kate and Ashley take on their toughest challenge ever when they become the personal trainers for out-of-shape villains Clive Hedgemorton-Smythe and his butler Bennington, who promise to go straight if the girls help them climb K2, the world's second tallest mountain!

Renee La Rouge is at it again. This time she's at an international clown festival to change every clown's humor unless Misty and Amber who go undercover as trapeze artists to restore all the humor and unmask her diabolical plan before the festival goes awry.

A New Zealand summit of the world's most talented teens is disrupted when the teens inexplicably lose their special abilities, and it's up to two teenage special agents, Mary-Kate and Ashley to unravel the mystery.

A rash of daring art thefts leaves a trail of evidence that points directly to Mary-Kate and Ashley! The girls must use all their special agent skills to stay at large while they clear their names, unmask the real culprits and return the stolen artwork.

Mary-Kate and Ashley go undercover at the new "Quick Food" restaurant to try to unmask the evil villains behind an apparent plan to take over the world's dining establishments and discover an out-of-control sibling rivalry of two brothers.

When the world's largest cat show in Cairo is disrupted by a series of cat-nappings Mary-Kate and Ashley head to Cairo to investigate, and this time it's Quincy's turn to go undercover - as a cat! - to expose Renee La Rouge's latest evil plan.

When rivers, lakes and oceans begin to rapidly evaporate, Mary-Kate and Ashley must outsmart and outmaneuver their old nemesis, the eccentric, cheese-munching Clive Hedgemorton-Smythe, in order to stop his plans to control all of the world's water.