Ep 17. Onyx

Onyx is the seventeenth episode of Smallville season 4. The episode starts with a boy named Tyler approaching Lex with a strange piece of black rock that he found in his backyard. When Lex tries to take the rock away from Tyler, the rock grants him a strange power, and he becomes possessed by the spirit of a former LuthorCorp employee.

Meanwhile, Clark and Lionel investigate the murder of a LuthorCorp employee, putting them on the trail of the same possession-causing black rock. As they dig deeper, they discover that the rock has ties to Lionel's past and a dangerous group of plant enthusiasts known as the Veritas Society.

As Lex becomes more and more consumed by the spirit possessing him, he begins to act recklessly and threatens the lives of those around him, including Lana and Clark. Clark and Lionel must work together to stop the possessed Lex and uncover the secrets of the Veritas Society before it's too late.

Throughout the episode, relationships are tested as characters struggle with their own fears and desires. Lana and Clark's relationship becomes strained as they grapple with the possibility that Lex may be beyond saving. Lionel's own secrets come to light, and his relationship with his son is put to the test.

The episode culminates in a thrilling confrontation between Clark and Lex, where Clark must use all of his powers to stop Lex before it's too late. The Veritas Society secrets are revealed, and the episode ends with the characters left to pick up the pieces of the dramatic events that have just taken place.

Onyx is a gripping and suspenseful episode in the Smallville series, delving into the darker side of the show's characters and exploring themes of power, trust, and control. Fans of the show will be on the edge of their seats as the characters navigate their way through this high-stakes drama.