Find out which 'Big Bang Theory' stars return for 'Young Sheldon' finale

After seven seasons, "Young Sheldon" will be airing a guest-filled final episode.

"Sheldon," which is a prequel series to the mega-popular "The Big Bang Theory," will be bringing back "Theory" stars Jim Parsons (played grown-up Sheldon Cooper) and Mayim Bialik for the last episode on May 16, according to ET .

Parsons and Bialik have not appeared onscreen together since the "The Big Bang Theory" series finale in May 2019.

While the cameos have been announced, any other information has not been offered as of yet.

Parsons is an executive producer of spin-off series "Young Sheldon," and does the program's voiceover work for the grown-up version of Sheldon. Bialik has also done voiceover work on the show, as a younger version of her "Theory" character appeared in the season two finale.

"Young Sheldon" airs its final episode May 16 on CBS.