The world of kids’ playthings has never been simply fun and games. It’s big money, and with big money comes intrigue and industrial espionage. When it’s an iconic brand, the stakes can become life or death, even if it’s something as seemingly wacky and weird as sea monkeys.
Yes, the little cartoon critters that would turn up as powder in an envelope and, when you added them to water, they suddenly emerged as brine shrimp. If your only memory of them is the ads in the back of comics, with a cheerful, alien-looking nuclear family swimming under the sea, you may be surprised that they’re still a multimillion-dollar business, and the center of a wild legal fight between the toy company that sold them and the one person that knows the secret of their creation.
That legal battle over this relic of midcentury Americana is at the center of Amazing Live Sea Monkeys, the new documentary from Mark Becker and Aaron Schock debuting at South by Southwest. Schock called it “a deep dive into the American aquarium, that you could scratch below the surface of a novelty and find corporate greed, misogyny, B-movies, extremist politics.”
The lawsuit is what first got them interested in the story, but what really drew them in was the story of Yolanda Signorelli, the woman Becker dubbed “the mother of sea monkeys” who put pride and principle over a quick cash payout from her business partners-turned-courtroom foes at Big Time Toys. When he and Schock read an article about her lawsuit, Becker explained, “we just sent a message out into the ether on one of those web browser-based ‘talk to this lawyer’ interfaces, and we got a call.”
They weren’t the only documentarians interested in the story. Yet after many phone conversations with Signorelli’s lawyer, his wife who was vetting the rival filmmakers, and finally Signorelli herself, they were the ones that Signorelli would talk to. Becker said, “I think she liked the way we conveyed how we would approach the subject.”
They quickly realized that the story wasn’t really about the sea monkeys, but about Signorelli’s own life as a B-movie exploitation actress, wildlife activist, and entrepreneur, and the surprising legacy of her late husband, Harold von Braunhut. A self-taught scientist, it was von Braunhut who came up with the secret preservation process that makes sea monkeys possible, as well as invented a host of wild and wacky toys like X-ray specs, Crazy Crabs, and the Invisible Goldfish.
“We were really honest with Yolanda that we wanted to tell the story about her fighting to get the sea monkeys back, but we also needed to go into this other realm,” Schock said about some of the unexpectedly darker and more shocking elements of the story. “I think we built some trust there that we weren’t going, ‘Oh, we don’t want to touch that stuff.’ We really need to be honest with the story that we find, and I think that there was some respect from Yolanda that we were open and honest.”
Finally, after months of phone conversations, they arrived at Signorelli’s mansion in Maryland to begin the filmmaking process. Becker recalled that moment: “We sat there before these gates that have ‘do not enter’ on them and these iron images of sea monkeys, and we called Yolanda, and that’s where our journey really began.”
Amazing Live Sea Monkeys
Documentary Spotlight, World Premiere
Friday 13, 6:15pm, Alamo Lamar
Saturday 14, noon, Alamo Lamar
Sunday 15, 10:30pm, Alamo Lamar
This article appears in SXSW 2026 Festival Guide.