Trivia: Tahmoh Penikett appears in this episode, and "Nemesis" as Wes Keenan, who gained super powers after being injected with the DNA of kryptonite-infected humans as part of Project Ares. Penikett also appeared in season 3 as Vince Davis, who came back to life after being given the Lazarus Serum, which was made from the blood of Clark Kent. The Lazarus Serum was a project by Lionel Luther and Project Ares was a project by Lex Luther.
Trivia: Chloe's mom in this episode is played by Linda Carter. Carter is known for playing Wonder Woman in the 1970's. Wonder Woman was one of the original members of the Justice League, but, like Batman, never appeared in "Smallville" and was only alluded to a handful of times.
Trivia: Aaron Ashmore appears for the first time as Jimmy Olsen. Aaron's twin brother, Shawn Ashmore, played Eric Summers in season 1 (and again in season 3). Aaron appeared throughout season 6,7, and 8, until Jimmy's death. Aaron would later play Jimmy's younger brother at the end of season 10. Incidentally, it was Shawn who played the superhero Iceman (Bobby Drake) in the X-Men films.
Answer: In the comics, Krypto is a dog from Krypton who was used as the passenger in a test launch by Jor-El, Superman's father, before he launched the actual rocket taking his infant son to Earth. Krypto's capsule was involved in a mishap, sending it out of Kryptonian orbit and eventually found its way to Earth where he linked up with the young Clark Kent. Like any native of Krypton, Krypto has superpowers on Earth. In Smallville, the dog is a standard Earth dog who has been experimentally injected with kryptonite, giving him super-strength for a limited period of time, who escapes and links up with Clark (who suggests the name Krypto, ostensibly because of the dog's cryptic origins). It doesn't take too long for the dog's strength to fade, and the Kents decide to keep him, although they ultimately name him Shelby, after a dog that Martha Kent had in childhood.
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