Classic Ben 10, Washington B.C.

While on a summer road trip with his Grandpa Max and cousin Gwen 10-year-old Ben Tennyson finds a mysterious device that allows him to change into ten different alien heroes.

Ben and his alien hero personas must battle Dr. Animo a crazed mad scientist bent on revenge and armed with the DNA altering transmorpher device. Animo uses the transmorpher to mutate normal animals into monsterous creatures and then to reanimate dinosaurs that run rampant in Washington D.C. Meanwhile Ben discovers being a hero is not just about getting rewards for your good deeds.

While stopped at a lakefront campsite Ben has a chance encounter with a Loch Ness-type sea monster called a Krakken. Eventually Ben discovers the true threat - the evil poacher Jonas and his high-tech deep water thieves who are arousing the Krakken by trying to steal its eggs.

Grandpa Gwen and Ben visit an elderly relative only to find that her retirement community has been overrun by a group of shape-shifting aliens!

Ben finds himself hunted down by three alien bounty hunters: the crustacean-like Kraab the mechanical assassin Sixsix and the mysterious hoverboard hired by Vilgax to procure the prototype watch. The experienced and powerful mercenaries provide Ben's alien heroes with their first true challenges. Fortunately Hoverboard is a double agent working on the side of good to make sure the Omnitrix doesn't wind up in the wrong hands. Unfortunately he is not too pleased that Ben treats the most powerful weapon in the galaxy as a toy.

Ben's prank backfires when he releases a Megawhatt a destructive monster made of electrical energy.

After an argument with Max Ben leaves for the city on his own and encounters a boy who has the power to absorb energy - and the power of the Omnitrix.

Ben discovers that a tough gang leader has merged with parts of Vilgax's robot drones to become an alien cyborg.

Ben must overcome his deathly fear of clowns when Gwen is kidnapped by the ringmaster at an evil circus.

Ben defeats a magician whose power comes from mystical charms. However when Gwen finds one of his charms she develops amazing luck in battle at the expense of Ben.

When Ben is prevented from riding an attraction at a water park because he isn't tall enough he decides to go alien to get even with the ride's attendant.

When Ben's actions cause him to catch a summer cold the normal symptoms take on strange physical changes in his alien personas. To make matters even more difficult Ben must stop a disgusting creature made from a colony of cockroaches while having to deal with these frequently funny unusual and often debilitating side effects on his heroes.

Healed from his injuries Vilgax decides to come after the Omnitrix prototype himself...