VERONICA INVESTIGATES HER CLASSMATES WHEN A SERIES OF BOMB THREATS ROCK NEPTUNE HIGH, ON "VERONICA MARS," TUESDAY, APRIL 12 ON UPN

Jonathan Taylor Thomas ("Home Improvement") Guest Stars as Ben, Joey Lauren Adams ("Chasing Amy") Guest Stars as Substitute Teacher Ms. Stafford, And Tina Majorino ("Napoleon Dynamite") Guest Stars as Mac

Four Original Episodes Until the May 10 Season Finale, Which Will Reveal Who Killed Lilly Kane

"Weapons of Class Destruction" -- A series of fire drills leads Veronica to discover that Neptune High has been receiving bomb threats, so she enlists Wallace and Mac's (guest star Tina Majorino) help to investigate classmates who could pose a serious threat to the school, including new student Ben (guest star Jonathan Taylor Thomas), on VERONICA MARS, Tuesday, April 12 (9:00-10:00 PM, ET/PT) on UPN. John Kretchmer directed the episode from a script by Jed Seidel. Joey Lauren Adams guest stars as Ms. Stafford, a new substitute journalism teacher.

Meanwhile, Keith stuns Veronica with the news of who he's been secretly dating. Later, Duncan confronts Veronica about her ongoing investigation into his sister's death.

Veronica Mars: Kristen Bell
Keith Mars: Enrico Colantoni
Wallace Fennel: Percy Daggs III
Duncan Kane: Teddy Dunn
Logan Echolls: Jason Dohring
Eli "Weevil" Navarro: Francis Capra
Van Clemmons: Duane Daniels
Mac: Tina Majorino
Alicia: Erica Gimpel
Geena Stafford: Joey Lauren Adams
Corny: Jonathan Chesner
Mrs. Murphy: Lina Castro
Meg: Alona Tal
Deputy Leo: Max Greenfield
Assistant: Lisa Velten
Girl #2: Anneka Nishijima
Ben: Jonathan Taylor Thomas
Norris: Theo Rossi
Pete: Michael McMillian

RATING: To Be Announced