Editor's note: This episode replaces the previously scheduled episode.

CHAOS ENSUES WHEN LEONARD'S RECENTLY DIVORCED PARENTS AND SHELDON'S DEVOUTLY RELIGIOUS MOTHER COMES TO TOWN, ON A REBROADCAST OF THE NINTH SEASON FINALE OF "THE BIG BANG THEORY," TUESDAY, JAN. 10

Emmy Award Winner Judd Hirsch Guest Stars as Leonard's Father, Alfred Christine Baranksi Returns as Leonard's Mother, Beverly and Laurie Metcalf Returns as Sheldon's Mother, Mary

"The Convergence Convergence" - Chaos ensues when Leonard's recently divorced parents, Alfred (Judd Hirsch) and Beverly (Christine Baranski), and Sheldon's devoutly religious mother, Mary (Laurie Metcalf), come to town. Also, Wolowitz and Koothrappali think the government is out to get them when they are contacted about their guidance system, on a rebroadcast of the ninth season finale of THE BIG BANG THEORY, Tuesday, Jan. 10 (9:30-10:00 PM, ET/PT) on the CBS Television Network. (Originally broadcast 5/12/16.)

REGULAR CAST

Johnny Galecki (Leonard)
Jim Parsons (Sheldon)
Kaley Cuoco (Penny)
Simon Helberg (Wolowitz)
Kunal Nayyar (Koothrappali)
Mayim Bialik (Amy)
Melissa Rauch (Bernadette)

RECURRING CAST:

Christine Baranski (Beverly)
Laurie Metcalf (Mary)

GUEST CAST:

Judd Hirsch (Alfred)
Marcus Folmar (Police Officer)

WRITTEN BY: Steven Molaro & Tara Hernandez & Adam Faberman

TELEPLAY BY: Chuck Lorre & Steve Holland & Jeremy Howe

DIRECTED BY: Mark Cendrowski