Mack was a security guard employed by Lex Luthor who developed a psychotic obsession with Lana Lang in the WB/CW Television series Smallville. He appeared as the main antagonist in the Season 6 episode "Trespass".
He was portrayed by Jordan Belfi.
Mack was hired by Lex Luthor to guard his fiance Lana from the hounding paparazzi. While guarding her, became obsessed with her and began stalking Lana. One night, Mack photographed Lana in her bedroom on his cellphone and sent the photo to her anonymously.
For her safety, Lana went to spend the night with Chloe at the Talon apartment but Mack had followed her. Hearing a noise, Lana went downstairs to find a wrapped present with a negligee in it and an note that reads "I want you to wear this... when I kill you."
Frightened, Lana tried run out of the exit door, but was accosted by dozens of paparazzi who forced her back inside. Brady, the head of security, escorts her back into the apartment just as Chloe arrives back home, also escorted by Mack.
Following this, Lana left the Luthor Mansion for her own safety, deciding to hide out at the Kent Farm. Brady and Mack took her to the Kent Farm and secured the house and the farm. Being part of Lana's security detail, Mack was able to continue stalking her. He sent Lana a threatening phone call while she was hiding in Clark Kent's bedroom. The caller said in a distorted voice that she can't hide and Lana noticed a puddle of blood seeping under the door.
Brady didn't answer when she calls and Lana opened the door to find that Brady had been killed. She was then startled by the flash of a camera and fell down the stairs. Lana was taken to Smallville Medical Center after her fall, but Mack once again sent her a threatening call. Dr. Langston reports that Lana and the baby are fine and tells Mack to move her to an older wing of the hospital to secure her safety.
As Lana explored the dilapidated old wing of the hospital, she was suddenly ambushed by a photographer who began taking pictures of her. Clark arrives just in time to throw the photographer across the room. Mack finally appears and carts him away. Clark helps Lana up when they hear a gunshot. Mack claims that he had a hidden weapon and he had no choice but to shoot him.
Thinking the ordeal is over, Mack takes Lana back to the Luthor Mansion. He tells her that Lex's flight is delayed due to the weather and Lana thanks him for protecting her. Mack muses that Lex shouldn't have left her alone. Lana asks him to tell the staff to bring her something to eat and he reports that he has sent all the staff and the rest of the security team home so they wouldn't get caught in the coming snowstorm.
He remarks that it was something Lana would do because she is good and kind, unlike Lex's other girlfriends. Lana is unnerved by his audacity, but he then reveals that he watches her every day. Lana realizes that Mack is the stalker, but she gains his trust by admitting that she didn't know what she was getting into with Lex.