Daphne Blake is trying to pass her driver's test and earn her license, a milestone that should be simple but quickly spirals into chaos. Riding in the Mystery Machine, she gets steady encouragement from her friend Velma Dinkley, who believes in her ability even as the nerves pile up. The moment Daphne crashes the van into a tree and fails the test, the mood shifts from supportive to frazzled, yet the two friends push forward, determined to prove themselves.
A twist of luck soon takes center stage: the two girls win a lottery that offers a chance to travel into space. They travel to Florida for the launch, where a larger crew gathers—a mix of bold explorers and ambitious personalities who will become part of a high-stakes voyage. Among them is the enigmatic billionaire Sly Baron, whose wealth buys access to the cosmos; a trained astronaut and a fearless idealist, Shaggy Rogers, whose easygoing humor lightens the mood; and veteran travelers like Zip Elvin, the seasoned pilot, and Colt Steelcase, the retired astronaut who carries decades of stories. Alongside them, the team includes the intense alien-hunting expert Ridley, the sharp and often skeptical Velma, and a group of other colorful characters, including the bold reporter who catches attention quickly. The assembled crew also includes the mysterious Uvinous "U-Boat" Botango, the athletic talent of a football player, and the loyal, often comical sidekicks Scooby-Doo and Fred Jones, both voiced by the same performer, Scooby-Doo and Fred Jones.
From the moment they blast off aboard Sly Star One, the journey shifts from a dream to a test of nerves and teamwork. The ship meets an offbeat, darkly humorous robot named H.A.M. who accompanying the crew with a grating humor that some find entertaining and others unbearable. The mood grows tenser as a mysterious alien begins sabotaging the mission, forcing the ship to crash-land on Sly’s moon-lit space resort on the far side of the Moon. The crew is greeted by Hudson Baron and the rest of the Sly Bots, a wave of robotic aides who add a mix of awe and unease to the adventure. In this unfamiliar landscape, revelations begin to surface about loyalty, ambition, and the price of curiosity.
In the wake of the crash, the group splits up: Scooby-Doo and Shaggy head off for food and a moment of lighthearted relief, while the others pursue the alien threat. The dynamic between Velma Dinkley and Daphne becomes strained, as Velma’s mounting irritation threatens the fabric of their friendships. The mystery deepens when the crew learns that the alien is not a true creature but a disguise used to manipulate them—and it’s up to the team to discern friend from foe as they navigate a web of deception.
As the chase unfolds, Shaggy Rogers and Scooby-Doo get a refresher on courage from a surprising source: the idea that they should summon something not to fear, a tip that helps them stay one step ahead of danger. A plan is hatched to trap the alien, but the tensions between Daphne and Velma threaten to derail it, underscoring the fragile nature of trust when pressure mounts. The mystery thickens as the truth about the space mission’s safety becomes a weapon in a larger plot.
The trap succeeds only to reveal a stunning twist: Shannon Lucas, the launch manager, is not just a presenter of good news but a mastermind in disguise. The plan she crafts is designed to convince Earth that space travel is too dangerous for ordinary people and should remain the domain of professionals. The dark scheme relies on an elaborate alien costume and the trust of everyone the crew has grown to rely on. The realization hits hard: Shannon exploited the group, manipulating their friendships to fuel a dangerous hoax. It’s a moment that challenges the bonds between the friends and forces them to confront how far someone will go for control.
In a dramatic turn, the truth about the highest space score is revealed—not Daphne’s, as Shannon claimed, but Shaggy’s, catching everyone by surprise and briefly shifting the balance of trust and suspicion. With time running out, Shannon tries to seal the fate of the crew by trapping them behind a glass barrier and detonating explosive devices across the resort. She retreats to Earth aboard her own repaired vessel, intending to leave the others to their demise.
The crew’s resilience is tested to its limit when H.A.M. reveals his true nature as a human actor under the disguise of a robot, a reminder that danger can wear many masks. The friends barely escape a deadly trap and rush toward a second, functioning version of the Sly Star One, rebuilt by Hudson Baron and the dedicated Sly Bots. The ship is damaged, the battle is close, and the odds seem stacked against them, but teamwork proves stronger than fear. Zip—tireless and calm—along with Colt Steelcase hold the precarious craft in place while Fred Jones lends steady guidance to the crew, and their trust in each other slowly rebuilds the bridge they thought was irreparably broken.
In a tense, cinematic sequence, the heroes are knocked unconscious by falling debris, and when they come to, the burden of leadership falls on Daphne. Velma’s earnest faith in her friend gives Daphne the confidence to take the helm and steer the ship home. The moment is framed as a testament to friendship: Velma’s belief that Daphne can succeed becomes a catalyst for a courageous finale. With courage blooming, Daphne pilots the ship back to Earth, bringing the crew home safe.
Back on solid ground, Shannon’s schemes are exposed, and she is taken into custody. The confrontation clears the air, letting the group heal their rifts and reaffirm their loyalty to one another. In the end, Daphne and Velma reconcile, their friendship restored and stronger for the challenge they faced. With the mission behind them, the Mystery Machine rides again, a symbol of their shared history, their courage, and their unbreakable bond as they drive back into the world, ready for whatever comes next.
