[4] During a global crisis called "The Emergency", Mr. Benedict, a talented and smart individual, recruits four kids for a dangerous mission to infiltrate the Learning Institute for Veritas and Enlightenment (L.I.V.E) on Nomansan Island.

[5] Kristen Schaal, MaameYaa Boafo, Ryan Hurst, Gia Sandhu, Mystic Inscho, Seth Carr, Emmy DeOliveira, and Marta Kessler were added as series regulars, playing Number Two, Rhonda, Milligan, Ms. Perumal, Reynie Muldoon, George 'Sticky' Washington, Kate Wetherall, and Constance Contraire, respectively, in April.

[6] Upon learning that he had gotten the role, Inscho said that he was "thrilled" and felt that the casting "made all of the hard work and efforts [he] put in worth it.

"[17] In another interview, DeOliveira said that the character of Kate Wetherall is "really fun, she is stubborn, adventurous, brave, and independent" and complemented her "willingness to just go for it, she doesn't always think everything through, but she is not afraid to just jump in.

The website's critics consensus reads, "The Mysterious Benedict Society has a slow windup, but its delightful supporting cast and sparky tone make for winning family entertainment.

"[36] Joel Keller of Decider gave the show a positive review and stated that it was "smart without being overly precious, but is just weird enough to keep kids' attention.

"[37] Petrana Radulovic of Polygon gave the show a positive review and stated that it "has all the components a great kid classic needs.

"[38] Josh Bell of CBR gave the show a positive review and stated, "The characters are distinctive and appealing enough to keep The Mysterious Benedict Society engaging even in its slower early stages.

"[40] Ashley Moulton of Common Sense Media gave the show five out of five and an '8+' age rating, stating "Everything about it is superb -- its acting, storytelling, and wonderfully immersive dystopian world.

"[41] Kristen Lopez of IndieWire gave the show a 'B+' and stated, "Manfredi and Hay aren't afraid to create a series that both praises the intelligence of children while also admitting that being a kid is weird and confusing.

"[42] Joseph Stanichar of Paste gave the show 7.5 out of 10 and stated, "Even though the children's performances fell a bit short, I hope that they'll grow on me throughout the series.

"[43] Nick Spacek of Starburst gave the show 4 out of 5 and stated, "Rather than being something for children with a few jokes the grown-ups will appreciate, it has the same youthful joie de vivre as a film like Moonrise Kingdom, but with the vivacity and energy of Spy Kids.

"[44] Joanne Soh of The New Paper gave the show 4 out of 5 and stated, "Hale may be brilliant as the narcoleptic genius, but the child actors are the real heroes, especially the scene-stealing Kessler.

"[45] Brad Newsome of The Sydney Morning Herald gave the show 3.5 out of 5 and stated, "Based on the novel by Trenton Lee Stewart, and with a quirky tone set by producer-director James Bobin (Flight of the Conchords), it should captivate its intended audience.

"[46] Lucy Mangan of The Guardian gave the show 3 out of 5 and stated, "What could have offered children a chance to understand the historically unprecedented aspects of the internet age they live in, made the young fish conscious of the water they swim in, is left simply as a romp.

"[48] Dan Fienberg of The Hollywood Reporter gave the show a negative review and stated, "There could be potential here, but not enough to build real enthusiasm.