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.