'Laverne & Shirley' stars reunite on Nick comedy

'Laverne & Shirley' stars Penny Marshall, Cindy Williams reunite on sitcom 'Sam & Cat'

In this publicity image released by Nickelodeon, Jennette McCurdy, portrays Sam, left, and Ariana Grande, portrays Cat from the Nickelodeon series "SAM & CAT." (AP Photo/Nickelodeon, Lisa Rose)

LOS ANGELES (AP) -- The leading ladies of "Laverne & Shirley" are reuniting.

Nickelodeon said Wednesday that Penny Marshall and Cindy Williams will guest star in an episode of its new sitcom "Sam & Cat."

The actresses starred as 1950s and '60s pals and roommates Laverne DeFazio and Shirley Feeney, workers in a Milwaukee brewery. The sitcom aired from 1976 to 1983 on ABC.

"Sam & Cat" features Jennette McCurdy and Ariana Grande as friends who start a baby-sitting business.

Nickelodeon says Marshall and Williams will start filming on Wednesday. They play characters involved in a decades-old feud, tweaking the long-ago rumors of a "Laverne & Shirley" rivalry.

"Sam & Cat" creator Dan Schneider says it was an honor to write for what he called TV's" funniest female roommates" ever.

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Nickelodeon is owned by Viacom Inc.