Ben is tasked with cleaning the Rust Bucket, but when he is tricked into letting the villainous and vile Fly Guys steal it, he must chase them down before they create an unstoppable maggot monster.
While winning big on a Sumo Slammers video game, Ben gets the idea to win a wrestling match for real until an intimidating wrestler named Iron Kyle decides to make it a true challenge.
Ben and Gwen's camping trip is interrupted by the emotionless Weatherheads (Gust-o, Hail-o, & Shock-o) but a malfunctioning Omnitrix firing out a mishmash of aliens may not be the forecast for success.
In a peaceful coastal town, Ben must not only face the archaic antagonist Steam Smythe and his latest creation, the Clocktopus, but also his deepest, darkest fear: Squids!
While trying to film his own indie film, Ben accidentally allows the Bug Gang to go free and when he takes the fight to their hidden lair Ben has to take on their narcissistic leader, the Ant Queen.
During a stop at the superstore Shopp?, Ben and Gwen are transformed into babies by nanny-gone-nuts Nanny Nightmare, who will stop at nothing to reshape the world in the image of her daycare.
While chilling at a monastery with a no-noise policy, Ben can't keep quiet and accidentally awakens a dangerous Dragon hidden in a secret chamber below the hallowed halls. A job that might be too much for even Diamondhead to handle.
When a wizard cos player gets his hands on a real, magical wand at Comic Con, Ben enlists Gwen to help stop Hex from retrieving it by tricking the wicked warlock into thinking she is a powerful magic-wielder in her own right: the one and only Lucky Girl!
Ben stumbles into Dr. Animo's secret lab now ruled by his superior mutants, the Alphas, and must help the lesser animals escape while stuck as Stinkfly.
While tailgating at a State U. homecoming football game, Ben teams up with Grandpa Max's old college buddies to keep the crazy clown Zombozo from robbing the stadium blind at halftime.
Ben, Gwen, and Max meet a family that appears to be a mirror image of them, but when Max goes off on a hike with their matriarch, Maxine, Ben is forced to babysit Simon Sez, a brat with a Billy Billions designed backpack that turns him into a formidable robot.
Ben, Gwen, and Max go on a tour of the impervious Fort Knox, but when Dr. Animo sicks a hungry ani-mutate on the Fort, Ben must stop it before it gobbles up the nation's monitory standard!
Ben, Gwen and Max make a return to Max's alma mater but this time it's no homecoming. Dr. Animo has made a scary transformation and found a way to release the very dangerous animal nature of humans, including Max's life-long friend!
No one believes Ben when he insists that one of the other patrons, waiting in line at the World of Wet Water Park, is the nefarious Frightwig, disguised as a girl called Frida.
Ben must go alien to save the Hoover Dam from disaster, but when tough guy hero Tim Buktu swoops in to "help", Ben must figure out if Tim is friend... or foe.
When Max drags the kids to see a defunct "House of the Future" built by his childhood idol, Ben discovers Steam Smythe is busy excavating the joint on the search for a powerful device that will allow him to create devastating weapons for his war on progress. Only Max's devotion to his childhood idol and Ben's faith in dreams can save tomorrow... today!
While mini-golfing, Ben is attacked by the Ground Hawgs, a gang of Dr. Animo mutants turned bikers. When the Hawgs realize the faux mini-golf village isn't an actual town, Ben must go alien to stop them before they set their sights on the real city down the road.
During Chefapalooza in the Rocky Mountains, three famous chefs and infamous bad-guys, The Tri-Chefta, hunt down Wildvine in hopes of creating their most exotic dish to date.
During a tour of historic Oldeville Ben finds a rare Sumo Slammers card, but when Billy Billions comes to claim the same card Ben has to battle Billy's high-tech drones which have hijacked the Rust Bucket!
When Ben interferes with malicious magician Hex's quest for the earth-moving Titan Gloves at a swap meet, he inadvertently switches bodies with Gwen forcing him to walk a mile in her shoes... and vice-versa!
When Ben (and Gwen!) attempt to stay up all night for Adrenaland, the only theme park open 24/7, he not only fails to utilize his alien powers to stay awake, but his "sleep-alien-ing" causes disaster after disaster that Gwen must fix before things get way out of hand.
Ben, Gwen, and Max stop by the graveyard set of Gwen's favorite TV show, The Unalivers, but when Ben discovers its lead, Michael Morningstar, is an energy vampire he goes alien to show the world the real star of the show: Heatblast.
When Billy Billions takes over Laser Town Studios for his birthday, Ben and Gwen challenge him to a Laser Tag Duel where the loser must never set foot in a game of Laser Tag ever again.
Ben and Gwen are excited to attend an Earth Day concert in Portland until the show is hijacked by the sound-manipulating baddy Lord Decibel who uses sound as a weapon to trash the planet.
At the annual Big Bacon Pig Parade, childhood "friend" Penny dampens the fun with her constant concerns about safety; Ben uncovers the Bugg Brothers' plot to rob a bank.
Ben, Gwen and Max revisit their favorite amusement park, renovated and re-branded as AdrenaWORLD! Unfortunately, the new management is Zombozo and his trio of new henchmen! He's got a plan to hypnotize everyone in the park to form a criminal army. Ben has to set aside his desire to ride every ride in the park and make things right.
When Gwen drags Ben along on a hike in search of the legendary Forgeti, a yeti that makes people forget they ever saw it, Ben is dubious. But with Dr. Animo on the trail of the mythical beast as well, what looks like a hoax becomes a hero time adventure for the ages, if Ben can remember it ever happened.
While Ben, Gwen, and Max hike to a waterfall, the Bugg Brothers are back with a plan to duplicate Diamondhead; but when their cloning ray gun fires on Max instead, multiplying him endlessly, Gwen and Ben must round up all the Maxes while also fighting off the Bugg Brothers.
Ben approaches Geezer Bob about doing a little yard work to earn spending money, but when Ben goes Upgrade to transform the lawnmower into a super fast mowing machine, he accidentally draws the ire of Bob's gnome-neighbors, the tiny, terrifyingly tenacious Billy-Bob Goblins.
Ben is more interested in a marathon of his favorite cartoon show, "Spazz", but when Ben goes Upgrade to get a better signal, the titular Spazz leaps from his animated dimension to ours, bringing mad chaos with him!
When the Rust Bucket runs out of gas on a foggy East Coast road, Ben, Gwen and Max are forced to stay at a hotel being menaced by Creepy Carl, a local folklore expert, who may actually be a ghost!
Touring Yellowstone, Ben uncovers a plot by the fast & furious LaGrange to find treasure buried below the national park, but with a little help from Old Faithful, Overflow is able to douse LaGrange's dreams.
Ben's vacation to Portland is cut short when he discovers an 11th alien while battling a Dr. Animo Mega-Creature. But when the fight leaves his Omnitrix on the fritz cycling through all 11 aliens, Max seeks help from an old friend to fix the Omnitrix as other dangerous forces seek it including a mysterious alien that's the same species as the 11th alien, Vilgax!
The Omnitrix is out of control so Ben seeks help from Max's mysterious friend to fix it; but the alien Bounty Hunters seek out the powerful watch for their own unknown purposes.
Ben has to stay in a forest to keep his transformations from endangering the public. When an alien crash-lands nearby, Ben teams up with him to take on the alien Bounty Hunters.
