It's Gonna Be The Mother of All Face Offs On "The Maternal Combustion"

1. "The Maternal Combustion"

Actresses Christine Baranski (as Leonard's mom, Beverly Hofstadter, left) and Laurie Metcalf (as Sheldon's mom, Mary Cooper, right) are heading back to the Big Bang set to make their mark on Season 8 on Thursday, April 30th at 8/7c.
Visiting their sons

2. Visiting their sons

A motherly affair is set for April 30th on The Big Bang Theory when Sheldon and Leonard's mothers stop by when they hear their sons are getting an award.
Time for a chat

3. Time for a chat

Leonard and Sheldon's mothers stop by their apartment in "The Maternal Combustion."
Beverly talks to Penny

4. Beverly talks to Penny

The Big Bang set just got that much more awkward when Leonard's mother and Penny stike up a conversation about Penny's engagement ring. 
All those lovely ladies

5. All those lovely ladies

Christine Baranski (left) and Laurie Metcalf (right) will make their mark again on Big Bang this week!
A can't miss episode

6. A can't miss episode

The Big Bang Theory has some big plans in store for this week's episode. 
Christine Baranski and Laurie Metcalf guest star

7. Christine Baranski and Laurie Metcalf guest star

Sparks will fly when these two ladies star during the same episode. Tune in Thursday, April 30th at 8/7c to see these well-known women as their hilarious characters on The Big Bang Theory. 
Just being honest

8. Just being honest

Find out what Sheldon has to say to Leonard.
Now, that's a hug!

9. Now, that's a hug!

This is a moment you'll just have to see for yourself on the April 30th episode of Big Bang!
A talk over coffee

10. A talk over coffee

Sheldon and his mother have an honest conversation.
The guys get down

11. The guys get down

What's happening here? You'll want the full scoop! 
Hanging out

12. Hanging out

Bernadette has a few thoughts of her own.