The title characters on Buffy the Vampire Slayer and Angel better brace themselves: Tonight's crossover event — starting at 8 pm/ET on the WB — features the much-anticipated return of queen vamp Drusilla (Juliet Landau). However, according to co-executive producer Marti Noxon, the ex-lover of Angel (David Boreanaz) and Spike (James Marsters) won't be commuting between both shows for long.

"The initial crossover shows her on Buffy, but she's really going to be populating the Angel universe," Noxon tells TV Guide Online. "That's where we're going to be seeing more of her."

Considering the winning chemistry between Landau and Marsters, some Buffy fans will no doubt feel that such news bites big time. But as Noxon explains, Drusilla's services were in greater demand on Angel. "In the Angel world, they're attempting to go a little more ensemble, and to have a little bit more of a season-long arc with characters, like we do on Buffy," she says. "So, it just felt right to bring a character who had some history and some weight and to take her over to the other show.

"Now, she may come over to Buffy at some point if [Juliet's] willing," Noxon adds. "I definitely think Drusilla may show up in our world."

For her part, Landau is game for Dru to go another round with Buffy, although she stops short of voting her the ghoul most likely to put the bite on The Chosen One. "If they were to go at it, I really don't know who would come out on top," admits the actress. "But Dru probably wouldn't be all that conventional in her way of fighting. She would be a force to be reckoned with, that's for sure."