Just watching the family of nine survive in the Alaskan bush is enough to make millions tune in to their Discovery reality show, but season 4 looks like it's promising to be the most dramatic season yet.
The network has also promised this season will tackle the "dark cloud" that hangs over the family as Billy and his oldest son, Bam (whose legal name is Joshua), after they plead guilty to lying about their residency late last year.
But none of that compares to the bombshell dropped at the end of the clip.
"30 years. We've heard nothing from her," Billy says.
"I've never forgotten her," adds his wife, Ami, as footage of what appears to be a woman stepping off a plane is shown. "She will always be our daughter."
Do the Browns have a secret daughter?
No answers have been revealed yet, but season 4 of Alaskan Bush People premieres May 6 at 9 p.m. ET on Discovery Channel.