1. And Then There Were 10

Ben discovers the Omnitrix when it attaches itself to Ben's wrist and it allows him to become any one of ten alien heroes.

2. Washington B.C.

Ben must use the Omnitrix to transform into alien heroes to battle Dr. Amino and his transmorphed dinosaurs running rampant in Washington DC.

3. The Krakken

While stopped at a lakefront campsite, Ben has a chance encounter with a Loch Ness-type sea monster called a Krakken, controlled by an evil poacher.

4. Permanent Retirement

Grandpa, Gwen and Ben visit an old maid relative, only to find that her retirement community has been overtaken by shapeshifting aliens called Limax.

5. Hunted

Three alien bounty hunters are hot on Ben's trail, but one of them is a secret agent trying to make sure the Omnitrix does not fall into evil hands.

6. Tourist Trap

While messing with the world's largest rubber band ball at a tourist trap, Ben accidently releases some mischievous electrical creatures.

7. Kevin 11

After a big argument with Max, Ben rebels by going out on his own in the Big Apple and makes friends with Kevin 11, who has plans for the Omnitrix.

8. The Alliance

As Four Arms, Ben works to thwart an armored truck robbery by a tough female gang leader named Joey, who delivers a disturbing message from Vilgax.

9. Last Laugh

Ben's fear of clowns emerges at an unfortunate time when our heroes stumble upon a wicked circus with a psychic vampire clown named Zombozo.

10. Lucky Girl

Ben battles an evil sorcerer whose power emanates from mystic charms, one of which turns Gwen into her own superhero named Lucky Girl.

11. A Small Problem

When Ben is not allowed on an attraction at a water park because he's too short, he decides to go alien to get even with the ride's attendant.

12. Side Effects

Ben catches a cold, and the symptoms wreak havoc on his alien heroes. To make matters even worse, he has to battle a creature made from cockroaches.

13. Secrets

Grandpa Max's mysterious past comes to light when Vilgax shows up on Earth in search of the Omnitrix, and the family must work together to defeat him.