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'Big Bang Theory' stars channel 'Grease' to benefit Alzheimer's Association

Even off the set of the CBS sitcom "The Big Bang Theory," its cast seems "Hopelessly Devoted" to one another — and a good cause.

Michael Yarish
The Big Bang Theory

Mayim Bialik, Kaley Cuoco, Johnny Galecki, Simon Helberg, Kunal Nayyar, Jim Parsons and Melissa Rauch dressed up in '50s outfits Wednesday and performed "We Go Together" from the hit musical "Grease" for "A Night at Sardi's," an annual fundraiser to benefit the Alzheimer's Association.

Backstage at #sardisfinalshow with @kunalkarmanayyar @normancook @therealjimparsons and Simon helberg

A post shared by mayim bialik (@missmayim) on

In addition to contributing to a good cause, the actors seemed to revel in the moment, with several stars posting highlights from the evening on Instagram.

"We'll always be together!" reads Rauch's group-photo caption, which mirrors a repeated lyric in the song's coda.

Summer Lovin with @kunalkarmanayyar #nightatsardis #endalz

A post shared by Melissa Rauch (@themelissarauch) on

Rauch also posted a photo with Cuoco and Bialik while they were "hanging backstage" and smiling for the camera.

The girls hanging backstage #nightatsardis @normancook @missmayim

A post shared by Melissa Rauch (@themelissarauch) on

Cuoco also went solo at the fundraiser, where she changed into dance attire to perform a song from "A Chorus Line."

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Prior to Wednesday night, "A Night at Sardi's" had raised $28 million for the Alzheimer's Association, according to the charity's website.

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