Twitter is overwhelmed by 'This Is Us' season finale's jaw-dropping ending

The Season 3 finale of This Is Us fast-forwarded to a future we’ve never seen before as the Pearson clan gathered at Kevin’s house to see an ailing, elderly Rebecca who, as it turns out, is the “her” alluded to at the end of season 2.

Many fans speculated that Randall and Beth would divorce after Tess wasn’t ready to see “her” in a flash-forward at the end of last season, and because Beth and Randall had been getting into some pretty gnarly fights in Season 3. But, thankfully, Randall and Beth are still very much together and fans couldn’t be happier.

But not everyone stayed together. Kevin and Zoe broke up because she doesn’t want to have kids, and the ending revealed that in the future, Kevin has a son.

Fans got even more good news: Baby Jack lived.

But fans now have even more questions heading into Season 4 — like why did Toby show up alone, and where’s his wedding ring? Where’s Kate? Toby tells Randall that he talked to Jack and “they’re” on the way, but it’s never specified who’s with Jack. It’s also not revealed who’s the mother of Kevin’s son. And, in a surprise twist, it’s not Miguel sitting by Rebecca’s side. Instead, it’s Jack Pearson’s younger brother, Nicky.

Fans were also left to speculate whether or not Rebecca was suffering from Alzheimer’s because Randall introduces himself to her, something This Is Us creator, Dan Fogelman, counted on, but played coy when asked about it.

This Is Us airs weeknights at 9 p.m. on NBC. Watch clips and full episodes of This Is Us for free on Yahoo View.

Don’t forget to check out Yahoo Play — our new interactive app where you can cash in your points and get tons of cool stuff! Download it now in the app store.

Check out the amazing American Idol artist the judges say is one of a kind:

Read more from Yahoo Entertainment:

Tell us what you think! Hit us up on Twitter, Facebook, or Instagram, or leave your comments below. And check out our host, Kylie Mar, on Twitter, Facebook, or Instagram.

Want daily pop culture news delivered to your inbox? Sign up here for Yahoo Entertainment & Lifestyle’s newsletter.