A/N: Like my AU of Supernatural Season 4, this season (and the ones to follow!) are going to be set in an alternate universe to the one's on TV, so there's going to be some minor (or major, depending on the situation) changes to the mythos of Smallville;
Clark's gay and has been ever since he came out to his parents when he was just 16 after developing a crush on Whitney Fordman. They've accepted his sexuality warmly and so have his closest friends and family; Chloe, Lois, Jimmy, Kara, Jor-El, Lana, The Justice League, etc.
Also since then he's had several relationships over the passing years; (in order of seasons)
Whitney Fordman (Season 1) – Not really a relationship but more of a secret crush Clark finally reveals his love to him at the end of this season's finale and (after a brief conversation that reveals that Whitney also had a crush on him over the passing year) gives him a goodbye kiss before he leaves for the Marines. He promises Clark that he'll write as much as he can and will return to him when his duty's done. When Whitney returns for that one episode in Season 2 Clark finds out that he's lost some of his memory during battle and thus, doesn't remember anything about their goodbye kiss or the promises he made to him. Whitney instead tries to get back with Lana (who he dated for a while before admitting his feelings for Clark) who doesn't yet know Clark's love for him as she accepts, not wanting to hurt Whitney's feelings. Soon after Clark discovers that Whitney's actually Tina Greer (who has developed the ability to shape-shift after being exposed to green kryptonite) and after a short confrontation, she ends up injuring herself and dies. Back at the Kent farm his parents are informed of Whitney's death overseas via a telephone conversation with his mother and when telling Clark, it totally devastates him, understanding the fact that he'll never know what would've become of their relationship.
Jason Teague (Season 4) – After the events that transpire in Seasons 2 & 3, Clark decides that he needs time to himself and takes a trip to Paris (instead of Lana like in the TV series) where he meets and eventually falls in love with one Jason Teague. When he returns to Smallville Jason goes with him and takes a position as the school's assistant football coach. He was fired from the school, however, when his relationship with Clark comes to light. By the end of this season though, he's revealed to have been working with his mother, Genevieve, to locate the three Kryptonian stones of knowledge. Jason, who believes that the secret of the stones lies with Clark, heads to the Kent farm where he holds Clark's parents hostage until they tell him where he is hiding the stones. Jason is killed, however, during the second meteor shower when a meteor falls through the Kent home and lands on him.
Arthur "A.C" Curry (Season 5) – After realizing that he's not the only superhero who has powers that are not derived from the meteor showers, Clark becomes attracted to the mysterious swimmer calling himself "A.C" after he saves Lois from drowning. After a heated, sexual romp with "A.C" (in which Lois interrupts unintentionally) the two heroes find out soon enough that what they have for each other is simply lust and not love and so part ways but still remaining close friends.
Oliver "Ollie" Queen (Season 6) – Clark first meets Ollie quite unexpectedly when his mother's necklace is stolen from a thief fully clad in green leather. He soon discovers that the thief was Ollie, who is actually the Green Arrow (a masked superhero who's extremely accurate with his bow and arrows) and had good intentions with stealing the necklace. After this little incident, Clark and Ollie develop a special bond which soon leads to a serious and quite intimate relationship that they feel might actually work (seeing as they've both know each other's secrets). Though, after several fallouts mostly concerning Ollie's recent drug fix (see Season 6 Episode 7 "Rage") and their concerns about others discovering their secret identities, Ollie thinks it's for the best if they break up and leaves Clark soon afterwards with the Justice League (Aquaman, The Flash, Cyborg and Martian Manhunter) after rescuing Bart from one of Lex's research facilities.
Grant Gabriel (Season 7) – The new editor-in-chief of the Daily Planet, Clark and Grant briefly become a couple after Lois introduces the two to one another. However their relationship's cut tragically short as Grant is killed by an unknown assailant. (If you want any more info, watch Season 7 Episodes 1-10 to get the gist about his character).
Oliver "Ollie" Queen (Season 7/8) – When Chloe intercepts confidential information from Lex, she's confronted by the Black Canary who steals the info back for Lex after a brief battle with the Green Arrow in which she shatters his arrows with her "Canary Cry". Trying his best not to come into contact with Clark, after their disheartening break-up, they face each other nonetheless (after confronting the Black Canary with the truth about Lex and asking her to join the Justice League) before both deciding to reconcile their relationship to which Ollie confesses to Clark that (during his time with the Justice League) he missed him terribly and hopes that he can forgive him for ever thinking of breaking up with someone he loves so much. Clark, more than happy to forgive him, accepts and are now a fully-fledged couple.
Everything else is pretty much the same though if you have any questions, please feel free to ask me!!!
The Cast
Tom Welling – Clark Kent
Allison Mack – Chloe Sullivan
Erica Durance – Lois Lane
Aaron Ashmore – Jimmy Olsen
Cassidy Freeman – Tess Mercer
Justin Hartley – Oliver Queen/Green Arrow
Supporting Cast
Phil Morris – John Jones/Martian Manhunter
Alaina Huffman – Dinah Lance/Black Canary
Alan Ritchson – Arthur Curry/Aquaman
Kyle Gallner – Bart Allen/Impulse
Lee Thompson Young – Victor Stone/Cyborg
Rachel Nichols - Mera
