Title: List of Smallville characters
Content:  John Glover portrays Lex's father, Lionel Luthor. Lionel initially sends his son to Smallville to run the local fertilizer plant, as a test. When Lex succeeds in making a profit for the first time in years, Lionel closes the plant down completely and blames it on Lex's poor managerial skills. As the series progresses, Lionel becomes interested in the Kawatche caves, which have Kryptonian symbols painted on their walls; his interests also extend to the secrets Clark keeps. After being possessed by Jor-El in the season five episode "Hidden", Lionel begins assisting Clark in keeping his secret hidden from Lex. In season seven, Lionel is murdered by Lex, who realizes that his father has been covering up the truth about an alien visitor.
Title: List of Smallville characters
Content: Françoise Yip as Dr. Tang ; Lorena Gale as Dr. Claire Foster ; Sarah Carter as Alicia Baker ; Alisen Down as Lillian Luthor ; Gary Hudson as Frank Loder 
Title: List of Smallville characters
Content: Alan Ritchson as Arthur Curry/Aquaman ; Lee Thompson Young as Victor Stone/Cyborg 
Title: List of Smallville characters
Content: Kyle Gallner as Bart Allen/Impulse ; Jane Seymour as Genevieve Teague 
Title: List of Smallville characters
Content: Adrian Holmes as Basqat ; Sharon Taylor as Faora ; Monique Ganderton as Alia ; Ryan McDonell as Stuart Campbell ; Pam Grier as Agent Amanda Waller ; Crystal Lowe as Vala ; Michael Shanks as Carter Hall/Hawkman ; Britt Irvin as Courtney Whitmore/Stargirl 
Title: List of Smallville characters
Content: Sarah-Jane Redmond as Nell Potter ; Jason Connery as Dominic Santori ; Tom O'Brien as Roger Nixon ; Hiro Kanagawa as Principal Kwan ; Robert Wisden as Gabe Sullivan ; Joe Morton as Dr. Steven Hamilton ; Kelly Brook as Victoria Hardwick ; Rekha Sharma as Dr. Harden ; Julian Christopher as Dr. MacIntyre 
Title: List of Smallville characters
Content: Kim Coates as Federal Agent Carter ; Don Broatch as Shaw Madson ; Alaina Huffman as Dinah Lance/Black Canary 
Title: List of Smallville characters
Content: Anna Williams as Eva ; Alessandro Juliani as Dr. Emil Hamilton ; Serinda Swan as Zatanna Zatara 
Title: List of Smallville characters
Content:   Smallville is an American television series developed by writer/producers Alfred Gough and Miles Millar, and was initially broadcast by The WB. After its fifth season, the WB and UPN merged to form The CW, which was the second broadcaster for the show in the United States. The series features a regular cast of characters, which began with eight main characters in its first season. Since then, characters from that first season have left the series, with new main characters having been both written in and out of the series. In addition, Smallville features guest stars each week, as well as recurring guests that take part in mini story arcs that span a portion of a season. Occasionally, the recurring 
Title: Smallville (season 9)
Content:  "multiple episodes". Odessa Rae was cast as the villainess Siobhan McDougal, also known as Silver Banshee. Smallville's McDougal is characterized as a "vengeful spirit of a fallen Gaelic heroine". The tenth episode of season nine featured a "bad guy version" of Green Arrow, known as the "Dark Archer", played by Steve Bacic. Carlo Marks has been cast to play Steven Swift/Warrior Angel, a potential love interest for Chloe. On February 22, 2010, it was announced that Gil Bellows would portray the DC Comics villain Maxwell Lord in at least one episode this season, with the potential for more episodes.

Question: who plays lex luthor on smallville?
Answer: Michael Rosenbaum.