“Finally, UPN had some direction,” Sternberg said. “Buffy” didn’t sustain the high ratings on UPN that it had enjoyed on the WB. Still, its arrival marked a turning point.

Twentieth Century Fox Television's "Buffy the Vampire Slayer" -- the signature drama of the WB network -- is pulling up stakes and moving to Frog nemesis UPN.

However, the UPN deal promises to resurrect the vamp-with-a-soul series for a minimum of two years if the WB should cancel it. Reuters contributed to this story.