Krypto-Lois accidentally hits a dog and brings it back to the farm to heal, but Clark quickly realizes it has super-strength. He investigates and discovers it was part of an aborted LuthorCorp experiment...and that robbers are using the dogs to help them steal money. Meanwhile, Lana wonders what Jason is up to with his mother, and Jason is forced to ask Genevieve a few questions of his own.
Days before it aired, fans and critics cringed at the anouncement that the writers would be bringing Krypto, the Superdog to Smallville. Just the thought of dog flying around Smallville with a red cap was horrifying, but luckily, the Smallville writers manage to stir clear of any "jump the shark" moments and make an average yet watchable hour of television. The writers once again revision a D.C. character to fit within the world of Smallville and in this incarnation, Krypto is one of 2 dogs apart of Luthorcorp's experiment that involves them being injected with a kryptonite serum that give them limited superstrength. Together, 2 brothers use both dogs to make big heists across Smallville until Krypto runs off and is found by Lois.
While this episode is light fluff, it's good light fluff. It's obvious that Tom Welling love dogs and his scenes with Shelby, who he later names, are undeniable cute. Also, Clark and Lois have some great interaction here as they fight over responisiblities over the dog. I also liked Lois's little pet names, especially when she names Shelby "Clarky" to irritate Clark. Also, the scenes where Shelby uses his strengh are priceless like rolling the tracker right into the fence and Clark's reaction. Even the Lassie-worthy scene of Shelby and Clark saving each from the exploding truck was entertaining despite being incredibly corny. Genevieve's storyline continues to intrigue as we learn why she is in Smallville and had her son get with Lana. "Krypto" is those rare occasions where the writers can get away with taking it easy, as "Krypto" could have been a massive trainwreck but was an enjoyable mild episode with some funny dialogue and nice interaction.