Hannigan met Denisof on the set of "Buffy the Vampire Slayer," but they didn't date until they had been friends for a while.
Of course, Hannigan credits "Buffy" and "Angel" executive producer Joss Whedon for her meeting Denisof but also gives a nod to one of her "Buffy" co-stars.
"We, of course, thank Joss," she says, "but we owe a lot to Anthony Stewart Head, because he -- I was actually there for the conversation he had with Joss -- when we knew there was going to be a new Watcher, Tony was saying to Joss, 'I know this guy, Alexis, who'd be great for that role.' So they brought him in, because Tony actually put in a word.
"But then, he balanced it out. That was a good deed, and then when -- Alexis and I were friends for a long time first -- then I came to Tony and said, 'Do you think Alexis and I should try dating?', he was like, 'Absolutely not. It's a terrible idea. Don't risk the friendship. You guys are too good as friends. You shouldn't mess that up.'
"Then he talked to his girlfriend, and she was, like, 'Absolutely. You're crazy. They're wonderful.' The next day, he came back and said, 'All right, Sarah said you should.'"