Welcome to the official 13th episode of "Smallville" Season 7 airs in the U.S. on Thursday, March 13th, 2008 at 8.00pm.
Titled "Hero", here's the official (spoiler filled) description from The CW...
Billboard chart topping band "ONE REPUBLIC" performs and Pete returns - Kara (Laura Vandervoort) and Jimmy (Aaron Ashmore) attend a "One Republic" concert and one of the roadies turns out to be former Smallville resident Pete Ross (guest star Sam Jones III). Pete unwittingly chews some kryptonite-laced gum and develops super powers. Clark (Tom Welling) and Chloe (Allison Mack) are thrilled to meet up with their old friend but warn him against using his powers in public. However, Lex (Michel Rosenbaum) discovers Pete's powers and blackmails him into helping break into a Lionel's (John Glover) safe by threatening to reveal Chloe is a meteor freak. Kristin Kreuk and John Glover also star.
Directed by Michael Rohl
Written by Aaron Helbing & Todd Helbing
The CW trailer is available
here and the director's cut clip is available
here
TV Guide has the following description for this same episode...
Former Smallville resident Pete Ross (Sam Jones III), now a roadie for the band OneRepublic, accidentally chews kryptonite-laced gum and gets superpowers. Clark and Chloe try to warn him about the effects, but Lex finds out and uses Pete for his nefarious schemes. Kara: Laura Vandervoort. Jimmy: Aaron Ashmore.
So welcome back Sam and it's been a while for Aaron Ashmore as well.