‘The Walking Dead’s’ Angela Kang talks about mysterious radio …

The season nine finale of "The Walking Dead" threw viewers a curveball when a mysterious voice came over a radio King Ezekiel was using at the Hilltop during the episode's final moments.

The voice sends a distress signal. It's tough to make out a lot of what is said. But you can hear the mystery person say, "Is anybody out there?"

If you were struggling to make out exactly what was said over the radio, you're not alone.

"It's garbled on purpose," showrunner Angela Kang told INSIDER of the mysterious radio message. "But, they basically are saying like, 'Hello, hello, is anybody out there?' We sort of are being a little coy at this point, to be honest."

Kang didn't confirm whether or not it was a woman or man heard over the radio. But if you watched the finale with closed captions, the final words on the episode are said by a woman.

According to closed captioning, the voice over the radio says, "Hello? Hello? Calling out live on the open air. Is anybody out there?"

Closed captioning shows the voice on the radio was definitely a woman. AMC

Expect the radio to play a role on the show as we head into season 10.

"It becomes a part of the story going forward in season 10. We'll see what happens," said Kang of the radio person. "Anytime we kind of encounter some mysterious circumstances like this, it's going to creep into the world of our heroes, and it will turn the story in some way. So, yeah, I'm looking forward to continuing with that story in season 10. But there's a little bit that we're not quite ready to reveal at this point."

In the comics, it's Eugene who makes contact with someone over the radio at Alexandria. He starts chatting with a woman named Stephanie from another community in Ohio called the Commonwealth.

We wouldn't be surprised if the show took a different route. Why? The season nine "TWD" trailer already teased the Commonwealth is out there in the world. We know Maggie is out there somewhere with Georgie, presumably at the Commonwealth. The show could be going even more off of the comics by revealing another group out there. Michonne's entire flashback story this season was off comic.

Do you remember this oh-so-brief moment from "TWD" season nine trailer, which showed off the word "Commonwealth"? AMC

Rick's also out there in the world somewhere. Maybe Ezekiel missed a very important call from wherever he has been holed up. It would be a great tie-in to the upcoming planned "Walking Dead" movies.

Looking forward to season 10, Kang says fans should expect more of Alpha, Beta, and the Whisperers, too. After all, they did just kill a bunch of people from the Hilltop.

"I think what we're really excited to tell is the story of what happens next with the Whisperers," said Kang. "There is definitely a major kind of conflict at this point between Alpha and Carol, but it extends kind of to all of our heroes. The Whisperers are so unlike any group that their methods and the ways that they interact with our heroes are going to be really different."

Beta and Alpha share a weird power dynamic on the season nine finale. Gene Page/AMC

"There will be some left turns in the story, too," teased Kang. "We'll work out what's going on with this voice over the radio. And, I'm really excited for just a season which, hopefully, let's us tell some different types of stories about how people deal with a hostile neighbor."

"The Walking Dead" will begin filming its 10th season in May. The show should return to AMC this fall. Kang will appear at a summit for AMC in April in New York City, which INSIDER will attend. You can keep up with our "Walking Dead" coverage here.

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'The Walking Dead's' Angela Kang talks about mysterious radio ...

Reviewed and Recommended by Erik Baquero