I accomplished quite a bit yesterday, watching 10 episodes in a 9 hour period, then went home and watched one more.
Here is what I watched:
Season 3
60 Crisis
61 Legacy
62 Truth
63 Memoria
64 Talisman
65 Forsaken (Part 1)
66 Covenant (Part 2)
Season 4
67 Crusade
68 Gone
69 Façade
70 Devoted
In short, here’s what happened:
A Kryptonite inspired, time-traveling telephone call from Lana 1 day in the future helps Clark save her from a gun-wielding zombie (writing that made me split my side and caused Jessica to comment “wow, that show is borderline retarded”).
Jonathan gets bugged by Jor-El that it is time for Clark to leave and begin his journey with Jor-El, but Jonathan stubbornly ignores it. Lex wires himself up for the FBI to investigate his father, Lionel. Then Lionel somehow gets the FBI to look into Clark and raid the Kent farm.
Chloe breaks into a LuthorCorp lab and gets exposed to a gas that compels those around her to tell only the truth. She gets Lionel Luthor to admit to hiring someone to kill his parents 20 years ago and saves it as a voicemail to herself. Pete (Clark’s best friend) almost lets Clark’s secret slip to Chloe. Lionel finds a way to erase his confession on Chloe’s voicemail (millionaires have it made).
Lex has been visiting the Summerholt Institute (evil brain “research” lab from previous episodes) to help him recover the memories he lost when his father submitted him to electroshock therapy. Clark tries to convince him to stop because Lex knew his secret during the weeks Lex lost, but falls into a trap placed by Lionel and is submitted to the memory treatment himself. The treatment backfires (duh, it’s Superman) and causes the lab to blow up, but not before Clark recalls his earliest memory: his mother being saddened at sending him away.
An ancient relic (knife) found in the Kiwatche Caves gives a member of the Kiwatche tribe superman-like powers. Professor Willowbrook (Kiwatche leader) believes that Clark is Namam, the man who fell from the stars. According to a prophecy, the knife belongs to Clark and can only be destroyed by his greatest enemy. Clark eventually defeats the Kiwatche tribe member that stole the knife, but has to watch as the knife turns to ash as Lionel and Lex Luthor touch it simultaneously. Pete reveals to Chloe that his parents are getting a divorce and his mom is moving to Wichita, aka: beginning of the end for Pete on the show 
Lana decides to move to Paris for her senior year, prompting Clark to invite her to dinner where he plans on revealing his secret so she will stay. A cloned childhood friend of Lana’s escapes from a LuthorCorp facility (she can move fast and walk through objects) and comes after Lana, wanting to rekindle their friendship. Clark saves her and puts the friend into custody somewhere. Pete gets roughed up by the FBI because he won’t disclose Clark’s secret. Chloe joins forces with Lex after recovering the voicemail where Lionel admits to killing his parents, leading to Lionel’s arrest for murder. Pete decides to move to Wichita with his mom because the burden of Clark’s secret it too great, causing Clark to renig on his plan to disclose his secret to Lana. Cue sadness for Lana.
Clark’s cousin Kara, from Krypton, arrives at the Kent farm to convince Clark to return with her to the Kiwatche caves where he will be transported back to Krypton for training and be reborn with the spirit of Jor-El. Kara later disintegrates an FBI agent eavesdropping on the Kent farm. Clark testifies again Lionel to deny him bail, then ends his friendship with Lex after finding that he had an entire room in the mansion dedicated to investigating Clark. The season ends with Clark being sucked in a crack in the cave wall, Jonathan collapsing into a coma, Lionel Luthor getting revenge: Chloe and her dad entering a witness protection safehouse right as it explodes, Lex drinks brandy in his mansion and collapes (presumably poisioned). Lionel smiles in his jail cell knowing he got revenge.
Season 4:
Lois Lane is introduced as Chloe’s cousin who comes to Smallville investigating her death. Lois finds Clark naked in a cornfield with amnesia but with the personality of Kal-El. Lana begins dating Jason Teague (aka Dean Winchester from Supernatural) in Paris but is absorbed in a light and mysteriously gets a Kryptonian symbol tattooed on her lower back forcing her to return to Kansas and investigate. Lex recovered from being poisoned by his father, but has to have his blood transfused every 72 hours or he will die. Clark (as Kal-El) steals an artifact Lex recovers in Egypt, but flies up to his plane and steals it mid-air (first time he flies). Martha is approached by an associate of Virgil Swan’s (Christopher Reeve) named Bridget Crosby (Margot Kidder – Lois Lane in the Christopher Reeve movies). She gives Martha Black Kryptonite, which forces Clark to return to normal.
Lois and Clark (that’s just fun btw) continue investigating Chloe’s death and discover that Lex and Lois’s father (Gen. Lane) are working together to prevent any investigation. Lana reappears in Smallville to learn the orgins of her new tattoo while Lionel Luthor sends out T1000 wannabe after Clark. Clark and Lois (much less fun) end up rescuing Chloe from metal-boy and learn that Lex had been keeping Chloe hidden so she could testify in safety. Lionel is convicted of murder based on Chloe’s testimony. Lois learns that her admittance into college is on hold until she completes 5 credits in HS…The Kents offer to let her stay on the farm.
Clark joins the football team as QB. ”Scabby” Abby (HS kids are clever) comes back after the summer with a new look but learns that her kiss causes insanity. Clark saves the day and wins the big football game.
The Cheerleaders formulate a Love Potion using Kryptonite that causes complete infatuation and infects the football team. Clark drinks it, becomes weak, then gets beaten up by Lana’s boyfriend and new assistant coach (Jensen Ackles). Lana works some magic and gets back into college without needing her Smallville credits.
