Two months after Bigfoot returns home, Adam, Jace Norman, becomes overwhelmed by the flood of attention his father’s newfound fame brings to their family. He’s also wrestling with how to tell his crush, Emma Shyloh Oostwald, how he truly feels.
Bigfoot wants to use his rising celebrity for a good cause, and when a group of protesters sends him a pointed letter about stopping Xtract, the Alaska oil company that claims to have zero environmental impact on wildlife, Bigfoot decides to take action. He feels pulled toward helping the cause in person, while Adam chips in by uploading a promotional video to social media in an effort to mobilize support. Soon, swathes of supporters rally behind Bigfoot, turning the spotlight into something that both excites and overwhelms the family.
One night, as Bigfoot tries to get a closer look at the company after hearing a distant rumble, he vanishes without a trace. Alarm bells ring for Adam and his mother Shelly Marie Chevalot as they, along with Wilbur Michael Sorich and Trapper Sébastien Desjours, embark on a road trip in a van toward Alaska to search for him. Arriving in the wilds, Adam and Shelly reconnect with Arlo Woodstock David Lodge, the protester who last saw Bigfoot, while Shelly quietly trails the lead and Adam, Wilbur, and Trapper stay behind to regroup.
Back at the van, the mood shifts to danger as Xtract guards ambush them, tranquilizing Wilbur and Trapper. Adam manages to slip away, and a tense encounter with a lone wolf unfolds—the beast threatening him but ultimately striking a wary truce with the boy. The wolf becomes a guiding ally, leading Adam toward Xtract’s hidden worksite and the truth behind the company’s operations. Inside the facility, Adam uncovers Xtract CEO Connor Mandrake Pierre Tessier plotting to unleash a massive bomb to speed up oil extraction, a plan that would devastate the valley he purports to protect. Adam seizes the moment, recording Mandrake on his phone to expose him to the world.
Woodstock lies in wait and captures Adam, pushing him into the underground mines, but the escape is far from over. Mandrake moves forward with the bomb, while Shelly and Bigfoot race to locate safety and to help free those trapped below. Adam reunites with Shelly and Bigfoot, and together they navigate the perilous mines while Xtract drones swarm the tunnels. Bigfoot fights them off, and Adam manages to upload the incriminating videos before losing his phone in the chaos. Realizing the threat is still active, Adam turns back to defuse the primary device, but Mandrake has a backup that can’t be switched off. With Wilbur and Trapper’s help, Bigfoot grabs hold of the device and hurls it into the air, triggering a colossal signal explosion that interrupts Mandrake’s plans.
As helicopters and police circle the scene, Mandrake makes a last-ditch escape but is derailed by a moose and cast into an oil puddle alongside Woodstock. In the aftermath, a quieter, hopeful moment arrives: some time later, Adam meets Emma again. She reveals that one of the videos he uploaded—accidentally—was the one that exposed his feelings for her. He asks Emma out, and she says yes, sharing a kiss as his family watches from afar, their emotional cheer echoing the film’s message of reconciliation, courage, and the power of standing up for what’s right.
