Ep 12. Pariah

Lana is plagued by a dark entity in Smallville season 4 episode 12 titled "Pariah." As the episode begins, Lana is busy training for swimming championships when she experiences a series of strange incidents that leave her worried and shaken.

At one point, Lana sees a figure with glowing eyes in her bathroom mirror, something that frightens her greatly. She tries to tell Chloe and Clark about it, but they are both preoccupied with their own problems and don't seem to fully understand or believe her concerns.

As Lana continues to experience more supernatural occurrences, she becomes increasingly isolated and anxious. She turns to Lex for help, but he is too caught up in the LuthorCorp business to be of much assistance.

The tension ramps up when Detective Maggie Sawyer returns to town to investigate a series of bizarre murders. Maggie and Clark work together to track down the killer, but they soon discover that the crimes are linked to Lana's mysterious tormentor.

As the situation becomes more dangerous, Lana must face her fears and confront the dark entity head-on. With help from Clark, Chloe, and Maggie, she learns the truth about her unwelcome visitor, and vows to take back control of her life.

Overall, "Pariah" is a thrilling and suspenseful episode that delves deeper into the supernatural side of Smallville. It also showcases Lana's strength in the face of adversity, and her determination to overcome whatever challenges come her way. With a well-paced plot and strong performances from the cast, this episode is sure to keep viewers on the edge of their seats.