Clark gets a super pooch; Jason's mom finally reveals why she's so interested in Lana; Lionel gives Jason a copy of a precious document.

What's up with Einstein: Two thieves pull up to a store and prepare for a heist. However, the two men won't be the ones pulling it off, instead they unleash two dogs to do their dirty work. The dogs, a blood thirsty one named Hercules and a more laid back one named Einstein proceed to get into the store and tear apart both the safe and an armed store clerk. Needless to say, these canines have some super strength and intelligence. When one of the thieves blows on a whistle, Hercules comes a running, but Einstein is no where to be found.

What's up with Lois: She leaves a message with Chloe telling her she's moving into the Kent's farm. Distracted by the phone conversation she doesn't see Einstein and hits him with her car. She takes him to the farm where he turns out to be fine and begins to show signs of super strength, at one point pulling the tractor he's chained to from the barn to the house. Jonathan tells them to make signs to see if they can find the dog's owner but when Clark notices a small microchip embedded in his fur they take him to the animal shelter to have it scanned. The younger of the two thieves happens to work at the shelter and when he approaches Einstein, the dog almost takes him apart. Clark scans the chip himself and finds out Einstein is owned by Luthorcorp.

What's up with the thieves: The two thieves are in the back of the animal shelter with Hercules. They're using vials full of liquid to shoot up the dogs and give them super powers.

What's up with Lex: Clark asks Lex if Luthorcorp has been experimenting on dogs. He tells Clark that his father started a program to mix meteor rocks with steroids to create super strong dogs. He proceeds to tell him he thought all the dogs were destroyed after he stopped the testing and maybe the Kent's farm would be a nice place for the dog to live.

What's up with Jason: His mother tells him why she doesn't want him with Lana. Turns out Lana is the countesses' descendent, as proof by the tattoo she magically got in Paris, and that the countess swore she'd kill all of a woman named Gertrude's decedents. Turns out Jason and his mother are those decedents. Later, Jason runs into Lionel who gives him a copy of the map Lex has and tells him it might help him find what he's looking for.

How it ends: Jonathan takes out the trash and is attacked by Hercules. Einstein, hearing the noise outside jumps through the farmhouse window and rescues Jonathan. As Hercules and Einstein stare each other down, a dog whistle blows and they both take off.

Clark and Lois figure out that the man from the animal shelter must be the thief that's using the dogs to rob people. They break in and find out that the next target is a Luthorcorp payroll truck. They track down the truck and while Lois frees the guards, Clark frees Einstein. But, when Einstein get out of his cage, he breaks a vile of kryptonite and Clark is left writhing in pain. The thieves then get in the van and drive off, with Clark still in the back. The thieves discover Clark in the back and decide to burn the truck with Clark and Hercules in it. After they douse it in gasoline, Einstein arrives and saves Clark by dragging him to safety. Clark dispatches the criminals as Einstein saves Hercules.

When Clark has a vet look at Einstein, the vet tells him he has a perfectly normal healthy dog. Clark is relieved and decides to name him Krypto but the rest of the family isn't so excited, so they settle on the name Shelby.