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Over the course of Will & Grace's run, we've gotten to know a lot about the four fabulous friends, including the vulnerable underbelly of everyone's favorite martini-chugging, pill-popping, millionairess with the high-pitched voice, Karen Walker (Megan Mullally). Though much of her backstory has been revealed — such as her days partying it up with the Reagans — there are still pieces of Karen's life that remain a mystery.

An upcoming episode looks to address that, providing a double shot of insight into her bizarre past by unveiling a major detail that might help explain why Karen is the way that she is today, for better or for worse. During this trip down memory lane, you can also expect to see the return of a familiar character who played an essential part in Karen's upbringing — and crafting this latest piece in Karen Walker's dysfunctional puzzle.

Judging from everything we've learned about Karen so far, this latest revelation should be a doozy

Will & Grace returns Thursday, Jan. 4 at 9/8c on NBC.

Megan Mullally, Will & GraceMegan Mullally, Will & Grace