Originally aired February 16, 2005
Written by Luke Schelhaas
Directed by James Marshall
Lois hits a stray dog and brings him back to the Kent Farm, but she and Clark quickly realize this is no normal canine when the dog displays super-strength.
Tropes present in the episode:
- Animal Testing: The Greenfield brothers conduct Kryptonite experiments on dogs.
- Heroes Love Dogs: Clark becomes attached to the super-strong dog. In the end, the Kents decide to keep the dog and name him "Shelby."
- Mundanger: The Greenfield brothers.
- Mythology Gag: The red towel they put on the dog after they bath him looks like the cape Krypto wears in the comics.
- Shout-Out: Shelby, a Golden Retriever, is originally called "Einstein".
- Sibling Team: Josh and Zack Greenfield who abuse the super dogs.
- Super-Strength: The dogs that the Greenfields experiment on gain this power.
- Title Drop: Clark considers naming the dog "Krypto" (because, as he explains to Lex, his origins are cryptic).
- Villain of the Week: Zack and Josh
