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Josh and Zack Greenfield, also known as the Greenfield Brothers, were brothers experimenting with enhancing dogs with super abilities by using liquid meteor rocks.

They served as the main antagonists in the WB TV series Smallville Season 4 episode "Krypto".

They were portrayed by Diego Klattenhoff and Nolan Gerard Funk, who also played Cooper Seldon in Arrow.

Biography[]

Josh Greenfield worked as a trainer at LuthorCorp where they conducted animal testing, specifically dogs, mixing steroids and meteorites to create super-powered dogs with the aid of a special serum. The effects however were only temporarily.

Seeing an opportunity, Josh stole the research and used it to create his own serum to enhance two dogs with superhuman strength from the animal shelter in which he and his younger brother, Zack, worked at. Having access to the serum, Zack and Josh began to use the dogs, Einstein and Hercules to commit robberies. The brothers trained the dogs to attack and be smart enough to steal for them.

Greenfield Brothers1

Zack and Josh Greenfield outside Smallville Grains.

During a robbery at a small town grocer, Hercules and Einstein steal from an elderly man. While Einstein opened a safe and took the money out, Hercules savagely chased the grocer into the backroom, and had the force to dent a steel door. Hercules attacked the grocer, mortally wounding him. Zack and Josh collect the rottweiler and the money but Einstein the retriever ran away into the night and was found by Lois Lane after running him over with her car.

Lois brought Einstein to the Kent Farm where he displayed his unique abilities and quickly formed a bond with Clark Kent. Lois and Clark realized there was something different about the dog and found an identification chip under his skin and they decide get the chip scanned at the vet. The Greenfield brothers were running the shelter and Lois noticed that the dog was growling at Zach and was reluctant to go with the brothers. They scanned the tag and the owner came up as LuthorCorp.

Josh and Zack Greenfield

Josh and Zack at the animal shelter.

Zack mused that it must be some kind of lab dog and offered to return it but Clark didn't want to leave the dog there so he asked Lois to take it back to the farm while he went to talk to Lex. Before they left, Zack made Clark leave his name and number for reference. Zack reports that Einstein has been found and was at the Kent Farm. Hercules was locked in a cage and Josh antagonized it. The brothers talked about the background of the super dogs and planned to get their dog back.

The Greenfield brothers sent Hercules to the Kent Farm to try to get Einstein back. During the dog attack, Jonathan was injured until the Rottweiler hears its calling whistle. It runs away and the retriever chases it away but returns to the farm. At the hospital, Lois pointed out that the only people who knew the dog was at the farm were Lex and the brothers at the vet and both decide to go investigate the vet's office. Clark found a map and a schedule for LuthorCorp's payroll. He figures out that the brothers were going to rob an armored truck.

Zack and Josh soon got the dog back, but this brought them into conflict with Clark Kent. He tries to super speed away from Lois but she insisted on driving them, slowly and carefully. Clark uses his super-hearing to locate the brothers. They arrive on the scene and saw the Greenfield brothers robbing a security truck with the dogs in their van subdued in cages with kryptonite liquid vials on top. Clark freed the dogs but the vials smash.

He falls ill from the kryptonite and the van drives off with Clark and Hercules in the back. The brothers stop eventually to switch cars and discover Clark in the back. Einstein has followed the truck to the site. They lock Clark in a cage and prepare to blow up the whole truck, but the golden retriever jumps in and pulls Clark to safety. After committing another robbery and attempting to murder Clark, he was saved by the escaped dog. Clark then knocked the Greenfields out and Einstein saved the other dog as well. Zack and Josh were apprehended by the police.

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