"Tempest" is the twenty-first episode and season finale of the first season of the WB original series Smallville. The episode originally aired on May 21, 2002; Alfred Gough and Miles Millar wrote the script, and Greg Beeman directed.^[1] In the episode's narrative, Lex attempts to forge his own destiny away from LuthorCorp; Whitney leaves Smallville for the Marines; Roger Nixon discovers Clark's secret and attempts to expose him to the world; and Lana is pulled into a tornado.

Director Greg Beeman attempted to create a visual theme among the characters that would parallel the approaching storm. The episode would mark the departure of Eric Johnson as Whitney Fordman, though he would return as a special guest in seasons two and four. Although the Smallville finale pulled in just over half of the viewership attained by the pilot episode, it was still favorably received by critics. It was also nominated for two awards.

Lionel Luthor (John Glover) shows up at the Smallville LuthorCorp plant, and announces that "management failure" has forced him to shut the plant down. Effectively blaming the problem on Lex (Michael Rosenbaum), Lionel informs his son he wants him to return to Metropolis. Clark (Tom Welling), Pete (Sam Jones III), Chloe (Allison Mack), and Lana (Kristin Kreuk) make plans for the spring formal. Whitney (Eric Johnson) informs Lana that he is enlisting in the Marine Corps, and he leaves for basic training the day of the dance.

Lex tries to initiate an employee buyout, and convinces the employees to mortgage their homes to help provide the financial resources to complete the buyout. Lionel learns of Lex's plans and buys the Smallville Savings & Loan, so that he may immediately foreclose on all the property when Lex's employees miss their payments. Roger Nixon (Tom O'Brien) tests Clark's abilities by setting off a bomb in his truck, while he is inside. Nixon confronts Clark in the Talon coffee shop, but Lex intervenes on Clark's behalf. Nixon follows Clark home and overhears a conversation about Clark's ship being in the storm cellar, and that Lex has the missing piece from the ship. Nixon goes to the Luthor mansion and steals the octagonal key, and immediately returns to the storm cellar with a video camera.

Clark, Chloe, and Pete arrive at the dance, and say their goodbyes to Whitney before he leaves for training. The weather begins to deteriorate, and a storm picks up, as Lana takes Whitney to the bus stop. Jonathan (John Schneider) and Martha (Annette O'Toole) decide to head to the storm cellar to seek cover from the storm, and they discover Nixon just as the octagonal disk activates the ship. Nixon attempts to escape with the videotape, and Jonathan chases out into the storm after him. The ship levitates off the ground and flies out of the storm cellar. Lana says goodbye to Whitney and drives home. On her way, storm winds force her off the road, right next to three tornadoes that have touched down. The students at the dance are alerted to the tornados that have been sighted, and Clark races off to make sure Lana is all right. The three tornadoes merge into one large tornado and move in Lana's direction. Clark arrives just as Lana, in the truck, is sucked into the tornado's vortex; Clark speeds into the tornado to rescue her.

When thinking of how to end the first season, two things were clear to Alfred Gough and Miles Millar: the final episode would have the school prom, and there would be tornadoes. Although Jeph Loeb's Superman For All Seasons, which inspired Gough and Millar when they created the show, contains an event where a tornado hits Smallville, the pair insist that the tornado idea came from a story they overheard on the radio about a tornado that hit a high school during their prom night.^[2] The episode would mark the departure of Eric Johnson as series star Whitney Fordman, though he would return as a special guest in seasons two and four.^[3][4]

This episode featured a lot of character development that many of the actors had been waiting for. Lana's jealousy over Clark and Chloe going to the prom begins to come out; Kristin Kreuk believes that Lana does not want to be jealous, and wants to be able to support Clark with his newfound feelings for Chloe. According to Eric Johnson, Whitney finally gets to show a side of himself that Johnson wishes the audience would have been able to see sooner, as Whitney gives Lana a private dance before the prom knowing that she will not be able to go because he is leaving town.^[9] To add further depth to his character not previously seen, Millar and Gough decided to send Whitney off to war, instead of killing the character outright. The idea of sending Whitney off to war was something that came to Millar and Gough midway through the season. They knew they did not want to kill him, because they wanted the ability to bring him back at some point in the future, so they came up with this "noble, heroic, send-off" for the character.^[10] For Lex, this episode featured the moment when he finally began to contemplate what his life would be like if his father was no longer a part of it. As Rosenbaum sees it, the moment that Lex hesitates to free his father from the support beam that collapses on him is the moment that the audience gets to see a hint of the evil man they know Lex will one day become. This is a brief moment where Lex forgets who he is, and if he had let his father die he would have certainly made his "turn to the dark side".^[7]

"Tempest" premiered on The WB on May 21, 2002.^[11] "Tempest" achieved a Nielsen rating of 3.8, meaning that approximately 3.8 percent of all television-equipped households were tuned in to the episode,^[12] putting the episode 68th in viewership for the week of May 20–26.^[13] The episode went on to be nominated for two awards, although it did not win either. The first was a 2003 Golden Reel Award for "Best Sound Editing in Television Episodic".^[14][15] Attila Szalay also received a nomination by the Canadian Society of Cinematographers for his work.^[16]

Reviews for "Tempest" were mostly positive. The Futon Critic's Brian Ford Sullivan felt that the season finale gave every element the "four-star treatment", and that the cliffhanger ending was "riveting" enough to leave the reviewer in anticipation all summer long of the season two premiere. Sullivan would go on to rank "Tempest" as the fifteenth best television episode of 2002.^[17] Jonathan Boudreaux, a reviewer for TVDVDReviews.com, felt the episode was one of the season's strongest, thanks to the focus on characters, with "kryptonite taking a backseat"; he referred to "Tempest" as the "slam bang season ending cliffhanger".^[18] Eric Moro of Mania.com believed that "Tempest" proved Smallville could "utilize the supernatural as a metaphor for teenage life", and that the finale managed to "recap the theme of the entire season, brought every dangling plot point to a head and closed with an ending sure to bring viewers back for a second season of super-entertainment".^[19] Author Neal Bailey was little more mixed in his opinion. He felt that for all the episode accomplished, it was not better than any previous episode that had aired that season; the episode lacked anticipation, based on the predictability of each character's actions.^[20]