The two will be featured in an episode airing Oct. 10 in what's expected to be a dramatic, emotion-filled story line.

A teaser for the episode reads: \"A patient at the hospital is brain dead after falling into a construction site, and her two sisters must decide whether or not to keep her alive.\"

Combs shared a photo with Milano and \"Grey's Anatomy\" Showrunner Krista Vernoff and executive producer and writer for the show, Andy Reaser.

View this post on Instagram

Reunited. And we couldn’t be happier. @kristavernoff @andyreaser well... there were some tears.... just some. @greysabc #CastFromThePast

A post shared by Holly Combs (@thehmc) on Sep 16, 2019 at 1:12pm PDT

\"Reunited. And we couldn’t be happier. @kristavernoff @andyreaser well... there were some tears.... just some. @greysabc #CastFromThePast,\" she captioned the post.

Milano also expressed her excitement for the upcoming appearance, captioning her post, \"This is going to be fun!\"

View this post on Instagram

This is going to be fun!

A post shared by Alyssa Milano (@milano_alyssa) on Sep 16, 2019 at 12:52pm PDT

The new season of \"Grey's Anatomy\" premieres Thursday, Sept. 26 at 8|7c on ABC.

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