Steve McGarrett is summoned home to Honolulu to bury his father after he is murdered by a madman. Governor Jameson wants Steve to head up a new elite police unit, and she will give him full authority to get the job done.

Sam and Dean investigate three bizarre deaths in the same town and learn that the victims are all tied to a real estate developer, Don Stark.

Ahsoka and Jedi Master Luminara escort captured Viceroy Nute Gunray to trial, where an assassin awaits to free the prisoner.

Zoe asks the Lightman Group to investigate a college football player accused of statutory rape; Loker and Foster try to determine if a religious compound is actually a cult.

Buffy's fifth-grade crush arrives in Sunnydale intending to deliver her to Spike in exchange for the immortal life of a vampire.

Buffy loses her slaying ability while trick-or-treating with neighborhood children.

Spike and his new recruits want to capture Angel and cure Drusilla.

The man who murdered McGarrett's father resurfaces; Chin Ho's life is put in danger during a hostage situation.

Buffy confronts Kendra, the new slayer in town, then must work with her to save Angel.

While McGarrett awaits trial for the murder of the governor, he receives an unexpected visit; Kono is suspended.

Angel's obsession with Buffy hits home, forcing her to involve her mother; Jenny attempts to fix things with Giles.

Buffy must destroy Angel after he loses his soul and reverts to his evil persona, Angelus; Giles learns that Jenny is a Gypsy.

Angel and Drusilla torture an imprisoned Giles; Buffy must prevent the mouth of hell from opening up and swallowing planet Earth.

While Angel attempts to unearth a demon who will annihilate the planet, Buffy reluctantly decides to destroy her former lover.

A heartsick ghost haunts the school halls, and Buffy helps the spirit find peace in a surprising way.

When Cordelia breaks off their secret romance, Xander gets student witch Amy to put a spell on her, with results far from what he intended.

McGarrett experiences what would have happened to the team had they taken a different path when he is kidnapped by Wo Fat.

Danny is abducted and badly wounded by Wo Fat's wife.

Kara (recurring guest star LAURA VANDERVOORT) tells Lex he is destined to defeat the Traveler and offers to take him to the Fortress to learn how. Clark is stunned that Kara would go to Lex, but it is revealed that Brainiac is impersonating Kara, and she is actually trapped in the Phantom Zone. Chloe is arrested by the Department of Domestic Security and Lana awakens from her comatose state. Meanwhile, in an epic turn of events, Clark and Lex face off in the Fortress, and Lex learns Clark's secret.

In a record-breaking event, the series' 200th episode brings back some familiar faces like JAMES MARSTERS as Brainiac. In an attempt to cheer up Clark, Lois convinces him to attend their five-year high school reunion in Smallville. A visit back to the home of the Crows has Clark remembering old times with Lana (past series star KRISTIN KREUK) and Chloe, while Lois is furious that no one remembers her five days as a student. Brainiac 5.0 (Marsters) uses his Legion ring to visit from the future and takes Clark through his past, present and future. He shows Clark what really happened the night Jonathan died, Oliver's current pain and Clark's future at the Daily Planet with Lois and his role as Earth's favorite red and blue superhero.