Fans of The Waltons and Little House on the Prairie are in for a treat next week.

On Tuesday, Sept. 21, four actors from each of the 1970s TV shows will reunite on the competition series Stars in the House. It's a trivia and charades show that reunites film and TV casts to benefit The Actors Fund amid the COVID-19 pandemic.

The Waltons, Little House on the Prairie: Stars in the House reunion

So, who can you expect to see on the reunion show? From Little House on the Prairie, set to appear are: Melissa Gilbert ("Laura"), Karen Grassle ("Caroline"), Matthew Laborteaux ("Albert"), and Alison Arngrim ("Nellie").

From The Waltons, it is: Judy Norton ("Mary Ellen"), Kami Cotler ("Elizabeth"), Eric Scott ("Ben"), and Leslie Winston ("Cindy").

The Waltons and Little House casts will match up against each other on the game show, which raises money for The Actors Fund. Viewers can also submit questions to the stars during the livestream on YouTube.

The WaltonsLittle House 2021 reunion show: How to watch

The Stars in the House event will stream live on Sept. 21 at 8 p.m. ET / 5 p.m. PT. You can watch for free on their YouTube page or the show's website.

The episode will also remain up on YouTube to watch for free any time after the livestream.

Both shows concluded back in the early 1980s but still have strong fanbases today. And it's not every day that you'll see the actors together. So don't miss the Stars in the House event on Sept. 21!

You can also click on the show titles here to see where the casts of The Waltons and Little House on the Prairie are today.

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Test your knowledge!

Which series featured the "Cartwright" family?