From Guest Star to TV Regular
Among those tv shows starring former BtVS or Angel guest stars are...

• Bull
• (Alison Jeffers) - Elisabeth Rohm (Det. Kate Lockley, Angel)
• (Carson Boyd) - Christopher Wiehl as  (Owen in "NKABOTFD", BtVS)
• (Carson's wife - recurring) - Elizabeth Anne Allen (Amy the witch, BtVS)
• Cleopatra 2525 (Cleo) - Jennifer Sky (one of "The Pack", BtVS)
• Caitlin's Way (Griffen Lowe) - Jeremy Foley (Billy Palmer in "Nightmares", BtVS)
• The Huntress (Brandi Thorson) - Jordana Spiro (Callie Anderson in "Reptile Boy")
• Roswell (Max Evans) - Jason Behr (Ford in "Lie To Me", BtVS)
• Popular (Harrison John) - Christopher Gorham (James Stanley in "I Only Have Eyes For You", BtVS)
• Once & Again (Eli Sammler) - Shane West (Sean in "Go Fish", BtVS)

Seen Them Before?
Guest stars in noticeable roles before their Buffy stint (See also the Links section):

• Michelle Trachtenberg (Dawn, BtVS) was the titular star of Harriet the Spy.
• Armin Shimerman (Principal Snyder, BtVS) starred as Quark on Star Trek: Deep Space Nine.
• Mark Metcalf (The Master, BtVS) was Doug Neidermeyer in Animal House.
• Dean Butler (Hank Summers, BtVS) is, perhaps, best known from Little House on the Prairie, where he played Almanzo Wilder.
• Bianca Lawson (Kendra, BtVS) was Megan in Saved By The Bell: The New Class.
• Kelly Connell (Worm man assassin in "What's My Line", BtVS) was the coroner on Picket Fences.
• John Ritter (Ted, BtVS)... well, he's famous for many roles, though, perhaps, most for playing Jack Tripper on Three's Company.
• Meredith Salenger (Grace Newman in "I Only Have Eyes For You", BtVS) was the title character in The Joruney Natty Gann.
• Max Perlich (Whistler from "Becoming" parts 1 & 2, BtVS) was a regular on Homicide: Life on the Street.
• Harrison Young (The old man Buffy saved in "Anne", BtVS) was the present-day Ryan in Saving Private Ryan.
• Jeff Kober (Kralik in "Helpless", BtVS) was Dodger on China Beach.

Dawson's Creek-- The Popular Post-Buffy Gig?
Among the many guest stars of Dawson's Creek have been...

• Eric Balfour (Jesse in "Welcome to the Hellmouth"/ "The Harvest", BtVS)
• Eion Bailey (one of "The Pack", BtVS)
• Jason Behr (Ford in "Lie To Me", BtVS)
• Bianca Lawson (Kendra in "What's My Line?" 1/2 and "Becoming, Part 1", BtVS)
• Adam Kaufman (Parker Abrams, BtVS)

Past History
Links to Buffy co-stars:

• Can't Hardly Wait- The King of All Links: the following all had parts in Seth's film Can't Hardly Wait.
• Eric Balfour(Jesse in "Welcome to the Hellmouth"/ "The Harvest", BtVS)
• Clea DuVall (the "Invisible Girl", BtVS)
• Christopher Wiehl(Owen in "NKABOTFD", BtVS)
• John Patrick White (Pete in "Beauty and the Beasts", BtVS)
• Nicole Bilderback (Cordette #1 in the Wish, BtVS)
• Channon Roe (Jack O'Toole in "The Zeppo", BtVS)
• Paige Moss (Veruca in "Wild at Heart", BtVS)
• Amber Benson (Tara, BtVS) all had parts in Seth's film Can't Hardly Wait.

• Christian Kane(Lindsay McDonald on Angel) is in Summer Catch with Marc.
• Channon Roe (Jack O'Toole in "The Zeppo", BtVS) is in Psycho Beach Party with Nicholas.
• Hal Robinson (Prof. Lester Worth in "Graduation Day, Part 1", BtVS) was in Simply Irresistible with SMG.
• Clea DuVall (the "Invisible Girl", BtVS) and Carlos Jacott (Ken in "Anne", BtVS, & Richard in "The Bachelor Party", Angel) were both in She's All That, in which SMG had a cameo.
• Danny Strong (Jonathan, BtVS), Jason Behr (Ford in "Lie To Me", BtVS), and Nancy Lenehan (Pat in "Dead Man's Party, BtVS), can be seen in Pleasantville with Marc.
• Greg Vaughan (Richard in "Reptile Boy", BtVS) starred on Malibu Shores with Charisma.
• Saverio Guerra (Willy, BtVS) starred on Temporarily Yours with Seth.
• Larry Bagby III (Larry, BtVS) had a part in Seth's film Airborne.
• Kelly Connell(Worm man assassin in "What's My Line", BtVS) and Jordan Baker (Sheila Rosenberg in "Gingerbread", BtVS) were both in an ep of Picket Fences with Alyson.
• John Ritter ("Ted", BtVS) starred in (Stephen King's) It  with Seth.
• Mark Metcalf (The Master, BtVS)  was in Woman Named Jackie (tv movie) with SMG.
• Max Perlich(Whistler from "Becoming" parts 1 & 2, BtVS)  had a part in Seth's film Can't Buy Me Love.

Family Ties
Serena Scott Thomas (Gwendolyn Post in "Revelations", BtVS) is the sister of Kristin Scott Thomas (The English Patient, Random Hearts).