'Freaks and Geeks' star begins as a guest but will soon become a 'Bones' regular

For more than two seasons now, "Bones" fans have been looking for a way to get Booth (David Boreanaz) and Bones (Emily Deschanel) to share their deepest, darkest feelings for each other.

Get ready to love Dr. Lance Sweets.

"I am a very green psychotherapist and I am treating Agent Booth and Dr. Brennan like they're a couple," says John Francis Daley of his character, who makes his first "Bones" visit on Tuesday (Oct. 23) night's episode. "It's a couples therapy session, which my character likes because it's a nice change from 'the crazies,' as he puts it. So I'm very new to it and making up theories as I go along, while at the same following strict textbook diagnostics."

That also means that Daley doesn't have to learn the mouthfuls of lingo that pepper the dialogue for most of the "Bones" actors.

"I think my character believes in what he's saying most of the time, but at the same time, a lot of it is bull," Daley laughs. "So it's fun to run to run off interpretations of things and not exactly have them be entirely accurate. I've done a little bit of research, but at the same time It's fun to be slightly ignorant."

Daley initially signed on only for a four-episode guest arc on "Bones," but he'll become a series regular after the 15th episode, giving the "Freaks and Geeks" veteran a chance to figure out what Dr. Sweets is all about.

"Honestly, I don't really know what his angle is yet," Daley explains. "I know that he wants them to get along and I think maybe he wants to help unleash suppressed chemistry that a lot of people at this point are noticing."

He adds, "I think that there's a comic element to my character -- the fact that he's so new to it, the fact that he's a 22-year-old with these highly trained professionals and basically telling them what's what wrong. It's also fun to be a little bit older in this, to play my age, which I haven't done much since 'Freaks & Geeks.'"

It's certain a change of pace seeing Daley playing a confident grown-up, a professional who shows up to work in a shirt-and-tie and expects his opinions to be respected. The 22-year-old actor remains fresh-faced and seems barely removed from his turns as inexperienced restaurant workers in both "Waiting" and FOX's short-lived "Kitchen Confidential," plus his memorable central performance as Sam Weir "Freaks and Geeks."

"When I came out here, I was very green and I thought that because a show was good and people liked it, that would be enough of a reason to keep it on the air," Daley recalls of his truncated "Freaks" experience. "Obviously I learned about the Nielsen ratings system after that and my whole idyllic world came crumbling down. At the same time, it's also a challenge to make a challenge that's good and appealing to fans and at the same time manages to find an audience. A lot of the time, it's just the luck of the draw."

Daley has made a bit of his own luck recently, selling the comedy "The $40,000 Man," a script he wrote with Johnathan Goldstein to New Line. When he hasn't been writing, he's been looking for a new small screen job.

"I've also been looking for a TV gig that'll be on TV for more than three episodes," he cracks. "I think I have a good shot with this one. It's a really fun show to be on and from what I hear, it's pretty successful, too, so that's a nice change of pace."

"Bones" airs on Tuesday nights at 8 p.m. ET on FOX.