The Big Bang Theory Photos from "The Separation Agitation"

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Bert is back on The Big Bang Theory Season 10 Episode 21, and he's excited to introduce his new girlfriend to the rest of the gang.

Meanwhile, Bernadette is heading back to work, but she and Howard have trouble leaving Halley in daycare.

Check out the photos below for a preview of "The Separation Agitation," airing Thursday, April 12th at 8/7c on CBS.

While you wait for the newest episode, you can always catch up on past episodes when you watch The Big Bang Theory online right here via TV Fanatic!

1. Lunch Time Conversations - The Big Bang Theory Season 10 Episode 21

Lunch Time Conversations - The Big Bang Theory Season 10 Episode 21
Leonard, Sheldon, and Raj have a conversation during their lunch break, and Howard is noticeably missing.

2. Bert Returns! - The Big Bang Theory

Bert Returns! - The Big Bang Theory
Bert is back on The Big Bang Theory Season 10 Episode 21, "The Separation Agitation."

3. Bert Joins for Lunch - The Big Bang Theory Season 10 Episode 21

Bert Joins for Lunch - The Big Bang Theory Season 10 Episode 21
Bert sits down with Raj, Sheldon, and Leonard for lunch, and he has a special announcement to make to the guys!

4. Making Plans with Bert - The Big Bang Theory Season 10 Episode 21

Making Plans with Bert - The Big Bang Theory Season 10 Episode 21
The guys chat with Bert over lunch, who is excited about his new girlfriend. But will she be able to get along with Sheldon?

5. Bernadette and Howard Talk About the Baby - The Big Bang Theory Season 10 Episode 21

Bernadette and Howard Talk About the Baby - The Big Bang Theory Season 10 Episode 21
Bernadette is heading back to work, and that means it's time to put Halley in daycare. But will they really be able to leave her?

6. Stuart Helps Out - The Big Bang Theory Season 10 Episode 21

Stuart Helps Out - The Big Bang Theory Season 10 Episode 21
Stuart helps out around the house while Howard and Bernadette struggle with leaving their baby in daycare.

7. We're All Getting Emotional - The Big Bang Theory Season 10 Episode 21

We're All Getting Emotional - The Big Bang Theory Season 10 Episode 21
Bernadette, Howard, and Stuart are all emotional at the thought of sending Halley to daycare.

8. A Confusing Conversation - The Big Bang Theory Season 10 Episode 21

A Confusing Conversation - The Big Bang Theory Season 10 Episode 21
Bert hangs out with the rest of the group at the apartment, and everyone looks a little confused as they listen to him.

9. Leonard and Penny Look Puzzled - The Big Bang Theory Season 10 Episode 21

Leonard and Penny Look Puzzled - The Big Bang Theory Season 10 Episode 21
Whatever it is that Bert is planning, it's definitely not something that makes sense to these two.

10. Sheldon Has an Idea - The Big Bang Theory Season 10 Episode 21

Sheldon Has an Idea - The Big Bang Theory Season 10 Episode 21
Well, of course he does. Because if there's any sort of problem, Sheldon is going to have a plan. Whether or not it's a good one remains to be seen.

11. A Special Occasion - The Big Bang Theory Season 10 Episode 21

A Special Occasion - The Big Bang Theory Season 10 Episode 21
This isn't just any night of takeout at the apartment. These guys are going all out. Just don't take Sheldon's spot!

12. Bert's New Girlfriend - The Big Bang Theory Season 10 Episode 21

Bert's New Girlfriend - The Big Bang Theory Season 10 Episode 21
Bert is proud to introduce his new girlfriend, Rebecca, played by April Bowlby, to the rest of the gang.

13. Time for Takeout - The Big Bang Theory Season 10 Episode 21

Time for Takeout - The Big Bang Theory Season 10 Episode 21
Bert and his new girlfriend spend some time eating takeout with the rest of the gang. This is definitely going to be interesting.

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The Big Bang Theory Season 10 Episode 21: "The Separation Agitation"
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The Big Bang Theory Season 10 Episode 21 Quotes

Bernadette: What if she likes the people who work there more than us?
Howard: She already likes soap bubbles more than us.

Amy: I thought you were taking a break from women to focus on your career?
Raj: Oh, grow up.