🚨There are some major Criminal Minds spoilers ahead! 🚨
1. Evan Peters Who he played: Charlie Hillridge, a teen who was abducted as a child and became his kidnappers' accomplice
Episode he appeared in: Season 5, Episode 16 "Mosley Lane"
Arturo Holmes / FilmMagic / Getty / CBS 2. Mark Hamill Who he played: John Curtis, aka The Replicator, the serial killer who copied the crimes committed by other killers captured by the BAU
Episodes he appeared in: Season 8, Episode 23 "Brothers Hotchner" and Season 8, Episode 24 "The Replicator"
Kevin Winter / Getty Images / CBS 3. Luke Perry Who he played: Benjamin Cyrus, the charismatic leader of the Separatarian Sect
Episode he appeared in: Season 4, Episode 3 "Minimal Loss"
Gabriel Olsen / FilmMagic / CBS / Getty 4. Elle Fanning Who she played: Tracy Belle, a young girl who survived two different serial killers
Episodes she appeared in: Season 2, Episode 6 "The Boogeyman" and Season 2 Episode 23 "No Way Out II: The Evilution of Frank"
Leon Bennett / WireImage / Getty / CBS 5. Rachael Leigh Cook Who she played: Maxine, Reid's girlfriend during the final season
Episodes she appeared in: Season 15, Episode 4 "Saturday" and Season 15, Episode 6 "Date Night"
Jesse Grant / Getty Images for Disney / CBS 6. James Van Der Beek Who he played: Tobias Hankel, the unsub who tried to rid the world of sinners and kidnapped Reid
Episodes he appeared in: Season 2, Episode 14 "The Big Game" and Season 2 Episode 15 "Revelations"
Bruce Glikas / FilmMagic / Getty / CBS 7. Aubrey Plaza Who she played: Cat Adams, aka The Black Widow Killer, the assassin who was simultaneously in love with and hated Reid
Episodes she appeared in: Season 11, Episode 11 "Entropy," Season 12, Episode 21 "Green Light," Season 12, Episode 22 "Red Light," Season 15, Episode 6 "Date Night"
Dia Dipasupil / WireImage / Getty / CBS 8. Jason Alexander Who he played: Professor Paul Rothchild, the serial killer determined to get revenge on Rossi after he sent his brother to death row
Episode he appeared in: Season 4, Episode 8 "Masterpiece"
Rich Fury / Getty Images / CBS 9. Mae Whitman Who she played: Julie, an abduction victim
Episode she appeared in: Season 5, Episode 5 "Cradle to Grave"
Amy Sussman / Getty Images for Los Angeles Confidential Magazine / CBS 10. Amber Heard Who she played: Lila Archer, an actor and Reid's potential love interest
Episode she appeared in: Season 1, Episode 18 "Somebody's Watching"
Craig Barritt / Getty Images for WE Day / CBS 11. Sheryl Lee Ralph Who she played: Hayden Montgomery, Rossi's second ex-wife
Episodes she appeared in: Season 11, Episode 20 "Inner Beauty" and Season 11, Episode 22 "The Storm"
Amy Sussman / Getty Images for dcp / CBS 12. Sterling K. Brown Who he played: Fitz, the head security officer for the US Embassy in Barbados
Episode he appeared in: Season 10, Episode 19 "Beyond Borders"
Amy Sussman / WireImage / CBS 13. Tim Curry Who he played: Billy Flynn, aka "The Prince of Darkness," a prolific serial killer and rapist
Episodes he appeared in: Season 5, Episode 23 "Our Darkest Hour" and Season 6, Episode 1 "The Longest Night"
Jason LaVeris / FilmMagic / CBS 14. Forest Whitaker Who he played: Sam Cooper, the Unit Chief for the BAU's Red Cell team
Episode he appeared in: Season 5, Episode 18 "The Fight"
Toni Anne Barson / FilmMagic / Getty / CBS 15. Ben Savage Who he played: Jason Gideon, the younger version of the iconic role played by Mandy Patinkin
Episodes he appeared in: Season 10, Episode 13 "Nelson's Sparrow" and Season 15, Episode 9 "Face Off"
Emma McIntyre / Getty Images / CBS 16. Danny Glover Who he played: Hank Morgan, the late father of Derek Morgan
Episode he appeared in: Season 11, Episode 16 "Derek"
Stephane Cardinale - Corbis / Corbis via Getty Images / CBS 17. Frankie Muniz Who he played: Jonny McHale, a graphic novel creator and serial killer
Episode he appeared in: Season 3, Episode 10 "True Night"
Eric McCandless via Getty Image / CBS 18. Cameron Monaghan Who he played: Jeffrey Charles, an underage serial killer who targeted other children
Episode he appeared in: Season 2, Episode 6 "The Boogeyman"
Momodu Mansaray / WireImage / Getty / CBS 19. Aaron Paul Who he played: Michael Zizzo, a high school student and suspect for cult-related murders
Episode he appeared in: Season 1, Episode 10 "The Popular Kids"
Taylor Hill / Getty Images / CBS 20. C. Thomas Howell Who he played: George Foyet, aka The Reaper, the serial killer who murdered Hotch's wife Haley
Episodes he appeared in: Season 4, Episode 18 "Omnivore," Season 4, Episode 25 "To Hell... And Back," Season 5, Episode 1 "Faceless, Nameless," Season 5, Episode 9 "100," Season 9, Episode 5 "Route 66," and Season 15, Episode 10 "And in the End"
Bobby Bank / Getty Images / CBS 21. Daryl Sabara Who he played: Kevin, a young boy involved in child pornography
Episode he appeared in: Season 2, Episode 2 "P911"
John Shearer / Getty Images for The Recording Academy / CBS 22. Jackson Rathbone Who he played: Adam Jackson, a serial killer and rapist
Episode he appeared in: Season 4, Episode 20 "Conflicted"
Michael Kovac / Getty Images for The Creative Coalition / CBS 23. Gavin Rossdale Who he played: Dante, a vampire-like rockstar and suspect of a murder investigation
Episode he appeared in: Season 5, Episode 7 "The Performer"
Axelle/Bauer-Griffin / FilmMagic / Getty / CBS 24. Matthew Lillard Who he played: David Roy Turner, a rapist, serial killer, and partner of a two-person killing team
Episode he appeared in: Season 8, Episode 6 "The Apprenticeship"
Alberto E. Rodriguez / Getty Images / CBS 25. Finn Wittrock Who he played: Harvey Morell, a serial killer and former accomplice of an earlier unsub
Episode he appeared in: Season 7, Episode 11 "True Genius"
Michael Loccisano / Getty Images / CBS 26. Bellamy Young Who she played: Beth Clemmons, Hotch's girlfriend
Episodes she appeared in: Season 7, Episode 10 "The Bittersweet Science," Season 7, Episode 14 "Closing Time," Season 7, Episode 16 "A Family Affair," Season 7, Episode 23 "Hit," Season 7, Episode 24 "Run," Season 8, Episode 3 "Through the Looking Glass," and Season 8, Episode 23 "Brothers Hotchner"
Kevork Djansezian / Getty Images / CBS 27. Michelle Trachtenberg Who she played: Diane Turner, the stalker who abducted and killed Reid's girlfriend Maeve
Episode she appeared in: Season 8, Episode 12 "Zugzwang"
Jamie McCarthy / Getty Images for EJAF / CBS 28. And finally, Tyler James Williams Who he played: Russ Montgomery, the technical analyst for the FBI's International Response Team
Episode he appeared in: Season 10, Episode 19 "Beyond Borders"
Robin L Marshall / WireImage / Getty / CBS If you want a little refresher and to watch these episodes again, every season of Criminal Minds is currently streaming on Paramount+ . View comments