Following are episodes that aired as part of season 5 of Smallville.
501. Arrival
Two superpowered Kryptonian villains arrive as the town struggles to recover from the meteor shower.
• Thu, Sep 29, 2005
• Directed by James Marshall
• Writer: Todd Slavkin and Darren Swimmer
• Cast: Tom Welling (Clark Kent). Kristin Kreuk (Lana Lang). Michael Rosenbaum (Lex Luthor). Erica Durance (Lois Lane). Allison Mack (Chloe Sullivan). John Glover (Lionel Luthor). Annette O'Toole (Martha Kent). John Schneider (Jonathan Kent). James Marsters (Milton Fine). Terence Stamp (Jor-El (voice)). Alana De La Garza (Aethyr). Leonard Roberts (Nam-Ek). Bud the Dog (Shelby). Camille Mitchell (Sheriff Nancy Adams (uncredited)).
502. Mortal
Clark is forced to steal a serum from a heavily guarded LuthorCorp research facility by three superhuman Belle Reve escapees who are holding Lana and his parents captive.
• Thu, Oct 6, 2005
• Directed by Terrence O'Hara
• Written by: Steven S. DeKnight
• Cast: Tom Welling (Clark Kent). Kristin Kreuk (Lana Lang). Michael Rosenbaum (Lex Luthor). Erica Durance (Lois Lane*). Allison Mack (Chloe Sullivan). John Glover (Lionel Luthor). Annette O'Toole (Martha Kent). John Schneider (Jonathan Kent). Kenneth Johnson (Lee). Camille Mitchell (Sheriff Nancy Adams). Todd Mann (Twin #2). Brad Mann (Twin #1). Judith Maxie (Belle Reve Doctor). Michael Tayles (Deputy Kaiden). Jase Anthony Griffith (Belle Reve Guard).
503. Hidden
Clark is shot and Chloe is kidnapped by a computer wiz who has programmed a missile to annihilate Smallville in hopes of ridding the world of the town's “meteor freaks.” Elsewhere, Lex questions Lana about the spaceship she saw.
• Thu, Oct 13, 2005
• Directed by Whitney Ransick
• Writer: Brian Wayne Peterson and Kelly Souders
• Cast: Tom Welling (Clark Kent). Kristin Kreuk (Lana Lang). Michael Rosenbaum (Lex Luthor). Erica Durance (Lois Lane*). Allison Mack (Chloe Sullivan). John Glover (Lionel Luthor). Annette O'Toole (Martha Kent). John Schneider (Jonathan Kent). Johnny Lewis (Gabriel Duncan). Camille Mitchell (Sheriff Nancy Adams). Bud the Dog (Shelby). Nathaniel DeVeaux (Commander). Rekha Sharma (Dr. Harden). Brad Turner (Lt. Bledsoe). Steve Lawlor (Lieutenant Taylor). Stacee Copeland (Nurse).
504. Aqua
Arthur Curry (Alan Ritchson), better known as Aquaman, arrives in town to destroy a new sonar weapon designed by LuthorCorp. Meanwhile, Clark meets Prof. Milton Fine (James Marsters), a.k.a. Brainiac.
• Thu, Oct 20, 2005
• Directed by Bradford May
• Writer: Todd Slavkin and Darren Swimmer
• Cast: Tom Welling (Clark Kent). Kristin Kreuk (Lana Lang). Michael Rosenbaum (Lex Luthor). Erica Durance (Lois Lane). Allison Mack (Chloe Sullivan). John Glover (Lionel Luthor). Annette O'Toole (Martha Kent*). John Schneider (Jonathan Kent*). James Marsters (Milton Fine). Alan Ritchson (Arthur Curry). Nathaniel DeVeaux (Commander). Shiraine Haas). Ken Yahko (Admiral).
505. Thirst
Lana pledges a sorority, unaware that its members are vampires.
• Thu, Oct 27, 2005
• Directed by Paul Shapiro
• Written by: Steven S. DeKnight
• Cast: Tom Welling (Clark Kent). Kristin Kreuk (Lana Lang). Michael Rosenbaum (Lex Luthor). Erica Durance (Lois Lane*). Allison Mack (Chloe Sullivan). John Glover (Lionel Luthor*). Annette O'Toole (Martha Kent*). John Schneider (Jonathan Kent*). Carrie Fisher (Pauline Kahn). James Marsters (Milton Fine). Brooke Nevin (Buffy Sanders). Erica Cerra (Courtney). Angelika Baran (Sorority Girl). Luciana Carro (Kayrin). Keira Kabatow). Kaare Anderson (Ramirez).
506. Exposed
Tom Wopat makes a guest appearance as a state senator---and old friend of the Kents---who is linked to the murder of an exotic dancer (Sarah Mutch).
• Thu, Nov 3, 2005
• Directed by Jeannot Szwarc
• Writer: Brian Wayne Peterson and Kelly Souders
• Cast: Tom Welling (Clark Kent). Kristin Kreuk (Lana Lang). Michael Rosenbaum (Lex Luthor). Erica Durance (Lois Lane). Allison Mack (Chloe Sullivan). John Glover (Lionel Luthor). Annette O'Toole (Martha Kent*). John Schneider (Jonathan Kent). Tom Wopat (Senator Jack Jennings). Jill Teed (Detective Maggie Sawyer). Woody Jeffreys (Mr. Lyon). Curtis Caravaggio (Wingate Owner). Noah Danby (Club Bouncer). Kristin Coutu). Sarah Mutch). Katharine Horsman (Dixie - Cowgirl).
507. Splinter
After Clark is pricked by a splinter of silver kryptonite, he becomes paranoid and thinks that everyone is conspiring against him---including his family and friends.
• Thu, Nov 10, 2005
• Directed by James Marshall
• Written by: Steven S. DeKnight
• Cast: Tom Welling (Clark Kent). Kristin Kreuk (Lana Lang). Michael Rosenbaum (Lex Luthor). Erica Durance (Lois Lane*). Allison Mack (Chloe Sullivan). John Glover (Lionel Luthor). Annette O'Toole (Martha Kent). John Schneider (Jonathan Kent). James Marsters (Milton Fine).
508. Solitude
When Martha is struck by a mysterious flash of light, Clark thinks it may have something to do with Jor-El's prediction that he'll lose someone close to him.
• Thu, Nov 17, 2005
• Directed by Paul Shapiro
• Writer: Todd Slavkin and Darren Swimmer
• Cast: Tom Welling (Clark Kent). Kristin Kreuk (Lana Lang). Michael Rosenbaum (Lex Luthor). Erica Durance (Lois Lane). Allison Mack (Chloe Sullivan). John Glover (Lionel Luthor). Annette O'Toole (Martha Kent). John Schneider (Jonathan Kent). James Marsters (Milton Fine). Terence Stamp (Jor-El (voice)). Aleks Holtz). Benita Ha (Dr. Asuka). Bud the Dog (Shelby).
