Sheldon's Mother Drops A Truth Bomb During The Holidays On The Big Bang Theory

After the holidays, Sheldon and Amy visit Penny and Leonard to talk about their not-so-very merry Christmas trip to Texas. Also, Howard and Bernadette catch the gang up on their first few cry-filled days as parents on The Big Bang Theory episode entitled "The Holiday Summation," which airs Thursday, Jan. 5 at 8/7c on CBS and CBS All Access.

Sheldon hassles Leonard about his Christmas decorations being up too long.

Sheldon hassles Leonard about his Christmas decorations being up too long.

After the holidays, Sheldon and Amy visit Penny and Leonard to talk about their not-so-very merry Christmas trip to Texas to visit Sheldon's mother, Mary, played by guest star Laurie Metcalf.

Also, Howard and Bernadette catch the gang up on their first few cry-filled days as parents on the next all-new episode of The Big Bang Theory entitled "The Holiday Summation," which airs Thursday, Jan. 5 at 8/7c on CBS and CBS All Access.
Amy and Sheldon look mildly disturbed.

Amy and Sheldon look mildly disturbed.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Mary, Sheldon, and Amy say grace around the holiday dinner table.

Mary, Sheldon, and Amy say grace around the holiday dinner table.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
No one throws a tantrum like Sheldon!

No one throws a tantrum like Sheldon!

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
If Sheldon wants to read that magazine, he might have a better chance by removing his undies.

If Sheldon wants to read that magazine, he might have a better chance by removing his undies.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Sheldon lets Amy know what's really on his mind.

Sheldon lets Amy know what's really on his mind.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Raj, Stuart, Howard, and Bernadette arrive with baby Halley.

Raj, Stuart, Howard, and Bernadette arrive with baby Halley.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Nothing out of the ordinary here. Don't most newborns travel with an entourage?

Nothing out of the ordinary here. Don't most newborns travel with an entourage?

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Raj and Stuart act as Halley's

Raj and Stuart act as Halley's "Doubtfire" and "Poppins."

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Leonard provides some story-time refreshments for his friends.

Leonard provides some story-time refreshments for his friends.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Raj looks on, stoically.

Raj looks on, stoically.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
The gang grabs a plate of nosh and catches up.

The gang grabs a plate of nosh and catches up.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Raj pulls up a seat to join the two couples.

Raj pulls up a seat to join the two couples.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Ready or not, Penny, Leonard, and Stuart are all ears.

Ready or not, Penny, Leonard, and Stuart are all ears.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Howard tries to get Bernadette to relax after a long night nursing.

Howard tries to get Bernadette to relax after a long night nursing.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)
Bernadette starts sobbing uncontrollably after spending the night soothing Halley.

Bernadette starts sobbing uncontrollably after spending the night soothing Halley.

"The Holiday Summation" (Episode 12, Season 10 of The Big Bang Theory)

Watch the next all-new episode of The Big Bang Theory on Thursday, Jan. 5 at 8/7c on CBS and CBS All Access.