The season four finale of Smallville , titled stands as one of the most pivotal and action-packed episodes in the series' history. Originally airing on May 18, 2005, the episode serves as a literal and metaphorical turning point, transitioning the characters from high school students to adults facing a world of extraterrestrial threats. The Hunt for the Stones of Knowledge

begins to lean into his darker impulses, helping Lana cover up the death while simultaneously maneuvering to secure the stones for himself.

is warned by the consciousness of his biological father, Jor-El, that failing to unite the stones immediately will result in a global disaster. A Second Meteor Shower

The "commencement" of the title refers not only to the graduation ceremony at Smallville High but also to the arrival of a second meteor shower. As Clark and his classmates celebrate their graduation, the sky turns red, forcing a frantic evacuation of the town. This event mirrors the series' pilot, bringing the high school years full circle with a sense of "epic scale and suspense". The Birth of the Fortress

Smallville 4x22: " Commencement " – A Finale of Cosmic Proportions

The episode’s final moments delivered one of the biggest lore reveals in the show’s run. After uniting the three stones in the Kawatche caves, Clark is transported to the Arctic. As he throws the newly formed Crystal of Knowledge into the frozen wasteland, it begins to construct the , setting the stage for his formal Kryptonian training in season five.

The primary narrative arc of season four—the search for the three Kryptonian Stones of Power—reaches its explosive climax here.