After Young Bennett discovers his parents' secret elevator, he learns he must protect it from Reginald Snodgrass to keep the world from falling into chaos. Elsewhere, his older self must avoid future Sophie as new laws preventing all time travel, including that within his own mind, come into effect. Meanwhile, a work trip for Carla goes awry when the newest members of the Galactic Alliance decide they want everything in the vault moved to their own planet so they can use its technology to protect their world and destroy all the worlds of their enemies.

Young Bennett is having problems sleeping while Mark is having problems staying awake. To resolve both problems, Bennett invents a sleeping helmet that allows him to accomplish needed takes in his sleep. When his dad takes him to the secret base and unleashes a dangerous specimen from the vault, however, it creates a time conundrum which may unite enemies in Bennett and Sophie while also revealing the existence of the vault to the public.

In an attempt to stop himself from being greedy, Old Bennett once again travels to the past to prevent his younger self from becoming a billionaire from a wild-scheme fundraiser. However, his entire future is altered when Young Bennett becomes a chocolate connoisseur and changes his future self from being a scientist to the new Willy Wonka. It also changes Edee from being an assistant robot to being a singing Oompa Loompa robot. Now Old Man Bennett must find a way to get the future back on track and prevent himself from owning the world's largest chocolate empire.

When the entire family becomes obsessed with devices, Carla decides they need an intervention and paces the entire family on a device free lockdown for the entire week. Young Bennett decides to invent a bracelet that will knock out any device he gets near for a 10 hour period unless it gets destroyed. Unexpected consequences arise though when it knocks out the power to the Undercover Base, the school, and Mama Robber soon learns of it and decides to use Bennett to break her son Meathead out of prison. Now it's up to Carla and a returning Duke to find a way to rescue Bennett from the robbers and keep the city safe from a massive power failure.

When Old Bennett realizes he has no empathy, he returns to the past and helps his younger self create a device that can read emotions. His ultimate goal is to develop empathy when Liam gets heartbroken by a girl (Jessica) who he's afraid doesn't see him. However, when the machine short circuits, it begins making the city infatuated with Liam. At the same time, Ambassador Cogentor visits the Bramble parents job to learn if Earth is a good place to leave their planet's technology, but their entire species specializes in not showing emotions.

Sophie reveals that a Unicorn Commando film competition is about to take place, and the winners will get cameos in the upcoming Unicorn Commandos 8 film. Young Bennett is determined to win, but when he reads Sophie's script, he fears that it goes against UCCU (Unicorn Commando Cinematic Universe) lore too much. He decides to become the film's director and correct everything he feels is wrong with Sophie's film, but when Sophie realizes what he's done, it just might break her heart. Meanwhile, the parents find their work facility under inspection, but when Young Bennett's special effects create a galactic scare, it could very well end up costing them all their jobs if they don't do everything by the book.

Bennett and Liam decide to place a wager on who will catch the bigger fish at their first ever Father/Son fishing trip, but when an alien seahorse gets loose in the water and gets enlarged by the former's fish enlarger, the group must put aside their rivalry and figure out how to save everyone without being eaten.

When the lone mayoral candidate, Maureen Dullvert announces she plans to extend the school day, Young Bennett decides to create an AI to oppose her because he needs more time to invent items. However, when the AI Trutherman takes over the entire web and declares he must run the entire world, it's up to the two Bennetts to convince him that not all humans tell lies and there are individuals that can be trusted.