Professor Quantum knows about the kids' time-travelling to Bible times.
The series' website says Professor Quantum built Gizmo to be Chris and Joy's companion and protector. Gizmo has a whole plethora of gadgets built into himself that help the kids to navigate their way around Bible times, including a geo-sensor that identifies the year and location where Superbook takes them on a given adventure. The only way Gizmo could have things like that built in is if Professor Quantum knew to put them there; and by extension, the only way he would know to design those things is if he knew the kids would be time-travelling to Bible times. Which therefore means he must know about Superbook, but is being a Secret Secret-Keeper.The Quantum parents ship Chris and Joy.
It would help to explain why Crispin programmed Gizmo to be a protector for Chris and Joy, and why Gizmo's also programmed to take orders from Joy as well as from Chris. Plus, Joy's been closely involved with the Quantums on several occasions, even frequently visiting their home and staying over for hours at a time, such as in "Gideon," where she stays with them while waiting for her parents to come home from an out-of-town trip. There's also episodes like "The Ten Commandments," where she joins the family on a camping trip (one that she couldn't otherwise go on without the Quantum parents' consent), and "Job," where Phoebe advises her to go and see Chris, who at that moment is sitting alone in his treehouse grieving for his recently-deceased grandfather.Jason will join the protagonists on a future Superbook trip.
After all, Chris does say in "The Road to Damascus," following the episodic Superbook trip, that maybe Jason, like Paul, has been chosen for a special destiny that Jason himself doesn't even know about yet. Perhaps that special destiny will be kickstarted by a Superbook trip just as it did for Jia Wei and Ellie.Why Chris, Joy and Gizmo are an Unusually Uninteresting Sight for the Bible-era people
The Bible-era people may have simply assumed that Chris and Joy's unusual clothes and names are just part of their being foreigners. Of course, there must also be some sort of Perception Filter (set up by Superbook and/or Gizmo) at play to mask Gizmo's obviously non-human appearance.- Alternatively, Superbook takes them to a simulation rather than the actual past, which would also explain the Hitler's Time Travel Exemption Act.
- However, this doesn't account for Phoebe's Laser-Guided Amnesia after joining the kids in one Season One episode, an event that gets a Call-Back much later on in Season Five. Plus, there's a minor Running Gag where some Bible-era characters who see Gizmo for the first time are initially not sure what he's supposed to be or why he looks the way he does (such as the episode with the wedding steward, where Jesus turns the water into wine, plus another episode which has young David assuming Gizmo's wearing armor).
- One could also bring up why nobody in Bible times questions two children going about without their parents accompanying them. However, since Chris and Joy are teenagers (despite the design of their characters; they go to high school), it is likely they would have been viewed as (young) adults rather than children.
- Chris and Joy attend Valleyview Middle School (basically, junior high school), and Joy explicitly states in "The Birth of John the Baptist" that she's 12 years old (which makes Chris about the same age, even though his age is never said out loud). In the Jewish religious economy, boys and girls are counted as having reached adulthood by the time they get to 12 years old (which is why Jewish boys have Bar Mitzvahs and Jewish girls have Bat Mitzvahs, both being coming-of-age ceremonies). Essentially, therefore, any Bible-era characters who see Chris and Joy walking around unsupervised wouldn't necessarily think twice about it, as they would—at the very least—view the two as being old enough to go here and there without as much need for parental supervision as much younger children would need. It's for the same reason why child!David would be entrusted to care for his father's sheep without supervision, as well as Micah the young shepherd having that same responsibility in "The Prodigal Son."
Superbook takes the travellers to a simulation, not back/forward in time.
This explains why Chris, Joy, Gizmo and the classmates they sometimes travel with are generally an Unusually Uninteresting Sight, as well as the instances of Hitler's Time Travel Exemption Act.At least the visits to the Garden of Eden, Judgement Day, the Great Flood, and the building of the Tower of Babel are inside a simulation, as these aren't taken by many/most Christians to be actual historical events. To be fair, Gizmo is unable to detect where they are in time (or detects that they are "outside of time and space") when they visit these places/events — and the issue of the historicity of the Tower of Babel is dodged when Gizmo's speech malfunctions just as he is announcing which time they are in.
