The Big Bang Theory - Simon Helberg, Katee Sackhoff

Bubble bath + a bottle of champagne + Battlestar hottie = one nerd-tastic Big Bang Theory. Battlestar Galactica alum Katee Sackhoff drops by Monday's episode to dispense some words of wisdom to a newly dating Howard Wolowitz — and soap him up in the tub too. "It's an interesting way to meet someone, getting naked and stepping into a bathtub," Simon Helberg, who can also currently be seen in the film A Serious Man, tells TVGuide.com. "I usually wait until after a handshake, but we basically popped right in there and did it — did the scene, that is." See what advice Starbuck has for the skirt-chasing genius, what's in store for Wolowitz's love life, and get an update on the Dr. Horrible sequel! 

TVGuide.com: Katee is your dream sci-fi woman and she gives you some relationship advice in your fantasy.
Simon Helberg:
Yeah, she's almost like my conscience. She's much prettier than Jiminy Crickett. She just basically says, "C'mon, you're not going to get me! You have this great girl and you're dropping her for a fantasy." I get disillusioned and I know what's the wrong thing to do.

Katee Sackhoff to appear on The Big Bang Theory

TVGuide.com: Since Katee is your conscience, that means she can come back, right?
Helberg:
There's definitely a possibility that she could continue to be his conscience. I don't know how much they plan for, say, the entire arc of the season. Who knows? Maybe next time they'll be in a Jacuzzi, maybe even the shower. I don't know if I have to be wet and naked. Maybe he always has to be in a compromising position. It is his fantasy!

TVGuide.com: It's good to see Wolowitz finally hit it off with someone like Bernadette. Is it time for him to get a girlfriend?
Helberg:
Yeah, but things are never smooth, but then again Howard is not smooth. He's learning the ways. I couldn't have seen it in any way. If I did, I wouldn't even think it would be a down-to-earth girl. It's nice, and you can see he's never really had girlfriends before. You get to see this human side of him you've never seen. I think it's time. He's worked; he's earned it. It'll be interesting to see how he copes with how this whole thing will affect his relationship with his mother. His heart certainly belongs to his mother.

TVGuide.com: They both have mama issues.
Helberg:
They do. [In the 10th episode], they're at his place. It's hard to get intimate with someone when you have an overbearing mother screaming at you from the next room. That's a buzzkill. He has to deal with all that. There's been no mention of [Bernadette] to my mom as far as I know yet. His mother is always in another room, so it's not conveyed to her necessarily that there's someone in there. There's a lot of room to play.

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TVGuide.com: Do you know how long his arc with Bernadette is? Is she the one?
Helberg:
It's certainly open-ended at this point. He hasn't blown it enough yet to scare her away. But he blows it every time. He's always doing something stupid. It's not even stupidity; he's just lost. [Laughs] He really tries, but he's missing some of those social contracts that many people have and he's full-force all the time. There's no subtlety to him. I think he's innocent and a romantic at heart.

TVGuide.com: If this becomes serious, he needs to stop chasing girls. Can he do that?
Helberg:
I can see him not gathering those boundaries and not picking up on that — that flirting is not OK. We haven't dealt with that yet, but it is in his nature to chase girls. It would be kind of fascinating to see if that goes away because he's so taken with her or if he's still got the compulsion to do it anyway. He's got a lot to learn, which is interesting because we haven't seen him learn much the whole run of the show. They're brilliant and set in their ways. It'll be nice to see him grow or [see] if he's incapable of it.

TVGuide.com: Has he ever had a second, third or fourth date before with the same woman?
Helberg:
I think he has had a second date. This is probably the most reciprocal relationship he's been in. I think he's had women use him, I think he's used women. I think he pays for women. [Laughs] But he's doing all right for himself now.

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TVGuide.com: You guys have landed some pretty nerd-tastic guest stars lately. Do you know if they've approached anyone else to come on?
Helberg:
I don't know if they've approached anyone. They don't tell us that much. I think it would be amazing to have Leonard Nimoy, obviously because of the napkin. Anybody from Star Wars, Star Trek. They're like religions to these guys. If Sheldon reacted that way to Leonard Nimoy's napkin, imagine how he'd be with him. They're very smart about who they put on and how they do it. It's cool that more people are watching and now people want to do it. Those geeky icons are fans of the show and they want to come on and make fun of themselves.

TVGuide.com: Do you have an update on the Dr. Horrible sequel?
Helberg:
My understanding is that it might be a movie, but it also might be another Internet thing. I don't quite know. I know they're working on the next installment. It will happen. When I talked to Joss [Whedon], he sort of told me some things, but what he was talking about was so intricate that I would not do it justice if I tried to explain it now! But it will happen and we're all going to be there.