Clark (Tom Welling) is attacked and wakes up in a mental asylum where the attending physician, Dr. Hudson (guest star Matthew Walker), tells him he has been there for five years due to his elaborate fantasy that he has alien superpowers. In this new world, Martha (Annette O’Toole) is married to Lionel Luthor (John Glover), Chloe (Allison Mack) is deemed insane and Lana (Kristin Kreuk) chose Clark over Lex (Michael Rosenbaum).

Lana begs Clark to agree to Dr. Hudson’s treatments so they can be together, but when a fellow patient named John, A.K.A Martian Manhunter (guest star Phil Morris), tells him the good doctor is actually a phantom and he needs to kill him in order to return to reality, Clark must make the toughest decision of his life.

Al Septien & Turi Meyer wrote the episode directed by Whitney Ransick.

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The Green Arrow (Justin Hartley) sends out for reinforcements and Bart Allan, a.k.a. The Flash (guest star Kyle Gallner), Aquaman (guest star Alan Ritchson) and Cyborg (guest star Lee Thompson Young) return to Smallville to help him take down LuthorCorp’s secret lab.

During a break-in at the LuthorCorp facility, Bart is captured and tortured by Lex (Michael Rosenbaum) and Clark (Tom Welling) sets off to rescue him but is felled by meteor rock. An alarmed Chloe (Allison Mack) goes to Oliver for help and the newly formed “justice league” springs into action to rescue Clark and Bart.

Kristin Kreuk, Erica Durance, John Glover and Annette O’Toole also star. The episode was written and directed by Steven S. DeKnight.

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After Lana (Kristin Kreuk) confesses to Chloe (Allison Mack) she has reservations about marrying Lex due to her lingering feelings for Clark (Tom Welling), The Daily Planet gossip columnist, Linda Lake (Tori Spelling), runs a story detailing their exact conversation. Determined to prove she didn’t give the story to Lake, Chloe investigates her fellow co-worker and discovers she has the ability to turn herself into water and uses it to secretly overhear conversations for her column.

Meanwhile, Lois (Erica Durance) begins to suspect Oliver (Justin Hartley) is the Green Arrow and enlists Clark’s help to prove it.

Michael Rosenbaum, John Glover and Annette O’Toole also star. Brian Peterson & Kelly Souders wrote the episode directed by Tom Welling.

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Clark (Tom Welling) is shocked to discover his neighbor Jed McNally (guest star John Novak) is holding migrant laborers captive and forcing them to work on his farm.

Feeling guilty since he sees himself as the ultimate illegal immigrant, Clark seeks help from Martha (Annette O’Toole) to allow a young boy (guest star Tyler Posey) and his mother (Maria Dimou) to stay in the country.

Kristin Kreuk, Michael Rosenbaum, Erica Durance, Allison Mack and John Glover also star.

Caroline Dries wrote the episode directed by Rick Rosenthal.

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Clark (Tom Welling) learns a Zoner has landed in Seattle and slaughtered the entire crew of a working ship. Upon investigation, Clark comes face to face with a horrifying Phantom (guest star Batista) who sucks the bones out of people.

Meanwhile, a patient (guest star Elias Toufexis) with the ability to morph into different frequencies escapes from LuthorCorps’ secret experimental lab and seeks revenge on Lex by imprisoning him in another spatial period where he can see and hear everyone but no one can see him.

Kristin Kreuk, Erica Durance, Allison Mack, John Glover and Annette O’Toole also star. James Morris & Shintaro Shimosawa wrote the episode directed by James Conway.

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Clark (Tom Welling) discovers the Green Arrow (Justin Hartley) was shot while trying to save a couple from a carjacking, but Oliver denies he was injured. However, when Oliver starts displaying erratic behavior, Clark and Chloe (Allison Mack) investigate and discover he is taking a super-drug that causes his body to heal itself but has severe side effects.

Meanwhile, Lana (Kristin Kreuk) makes a shocking discovery that will impact her relationship with Lex (Michael Rosenbaum). Erica Durance, Allison Mack, John Glover and Annette O’Toole also star. Todd Slavkin & Darren Swimmer wrote the episode directed by James Marshall.

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After escaping from the Phantom Zone, Raya comes to Smallville to visit Clark. Raya and Clark grow close, and Raya reveals how to repair the Fortress of Solitude. Unfortunately, Baern, another escapee seeks out revenge on Clark and Raya for his time spent in the Zone.

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Lex and Oliver Queen return to their old prep school for a reunion, but Oliver’s old friends (and Lex’s old enemies) start dying in mysterious accidents. Meanwhile, Clark learns that someone… or something may have left the Phantom Zone with him.

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The mysterious Green Arrow steals a necklace from Martha, and both Lois and Clark resolve to find out who the vigilante is. While Clark determines Green Arrow’s true identity, Lex continues his investigation of the mysterious black box while Lionel warns Lana against him.
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Clark and Chloe pursue a plant creature that uses male humans to recreate, one which has taken Jimmy Olsen as its next human breeding ground. Meanwhile, Oliver Queen asks a reluctant Lois to be his date at a charity ball held by Lex.
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