12 Scenes from The Big Bang Theory's "The Colonization Application"

1. "The Colonization Application"

Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars and Leonard surprises Penny with a very "adult" purchase, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Johnny Galecki, Kaley Cuoco-Sweeting, Jim Parsons and Mayim Bialik Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
Shamy

2. Shamy

Trouble arises when Amy (Mayim Bialik, right) learns Sheldon (Jim Parsons, left) has applied for a one-way mission to colonize Mars, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
Raj and Emily have a chat

3. Raj and Emily have a chat

Raj (Kunal Nayyar, right) is caught snooping in Emily's (Laura Spencer, left) apartment, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
Missions and surprises

4. Missions and surprises

Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars and Leonard surprises Penny with a very "adult" purchase, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Johnny Galecki, Kaley Cuoco-Sweeting, Jim Parsons and Mayim Bialik Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
A happy couple

5. A happy couple

Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars and Leonard surprises Penny with a very "adult" purchase, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Johnny Galecki, Kaley Cuoco-Sweeting, Jim Parsons and Mayim Bialik Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
Pretty Emily

6. Pretty Emily

Raj is caught snooping in Emily's (Laura Spencer, pictured) apartment, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
Raj was caught

7. Raj was caught

Raj (Kunal Nayyar, left) is caught snooping in Emily's (Laura Spencer, right) apartment, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
Peeking at some pets

8. Peeking at some pets

A trip to the pet store ends in a fight for Sheldon (Jim Parsons, right) and Amy (Mayim Bialik, left), on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
Sheldon eyes an animal

9. Sheldon eyes an animal

A trip to the pet store ends in a fight for Sheldon (Jim Parsons) and Amy, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
What's Leonard's surprise?

10. What's Leonard's surprise?

Leonard (Johnny Galecki, right) surprises Penny (Kaley Cuoco-Sweeting, left) with a very "adult" purchase, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
What exactly is Howard up to?

11. What exactly is Howard up to?

Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars. Also, a trip to the pet store ends in a fight for Sheldon and Amy, Leonard surprises Penny with a very "adult" purchase, and, Raj is caught snooping in Emily's apartment, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Simon Helberg and Melissa Rauch Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.
A hug we love

12. A hug we love

Trouble arises when Amy (Mayim Bialik, right) learns Sheldon (Jim Parsons, left) has applied for a one-way mission to colonize Mars, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.