The Math Book
Math bookMelissa completes her quest.
Production code: 110b
Broadcast order: 20
Written by:
Dani Vetere
Storyboards by:
Joseph S. Scott
Directed by:
Bob Bowen
Broadcast Information
U.S. Premiere:
March 21, 2017
International Premieres:
see below
Paired with
"Battle of the Bands"
Some say [Fred the Janitor] doesn't even exist.

But you just said he's the janitor.

Some say I said he's the janitor

— Melissa Chase and Zack Underwood

The Math Book is the 20th episode in the first season of Milo Murphy's Law.

Episode Synopsis

Milo and Zack go on a quest to help Melissa get a book she left behind at school.


Milo, Zack, and Melissa return to Jefferson County Middle School after school hours due to Melissa forgetting her math book in one of the classrooms. As they head in hoping to find it, Melissa and Milo discuss the existence of the "Great key-keeper" aka Fred the janitor, who supposedly sends students on "quests towards enlightenment." After obtaining a key to the classroom from Principal Milder, the trio recover the book only to forget the key inside the room, which locks behind them. Despite Zack's disbelief, Milo and Melissa then believe that Fred is providing signs that will help them find him so that they can get back into the classroom and recover the key.

The trio's "quest" takes them into the janitorial office - where they encounter Mr. Drako - and then into a locked storeroom that opens up into the old school library. They then discover a secret passage that leads to their science classroom, eventually making their way outside where Coach Mitchell informs them that he saw someone on the roof. Investigating, they fail to locate Fred but succeed in discovering a roof hatch that enables them to get back into the class to recover the key, which they promptly return to Principal Milder. Fred then appears to Milo and Melissa and asks for their help in cleaning up the mess caused by their "quest."


For a full transcript of "The Math Book", click here.


1 It begins
The image gallery for The Math Book may be viewed here.


Production Information

  • The segment was first released on the Disney XD app prior to its premiere date.


International Airings

  • July 7, 2017 (Southeast Asia)
  • August 9, 2017 (Disney Channel Israel)



  • The Pyramids and Stonehenge - There are models of the respective sites in the janitor's room.
  • "When one door closes, another opens" - When Milo sees a vent to get into a locked room, he says a quote he got from his father. The quote is based on the already popular saying.
  • iPad - Melissa's rPad is based off a real-life computer tablet product, the iPad.


  • When Melissa is trying to take the key from Principal Milder, the desk appears to cut into her waist.
  • When Melissa tells Zack that Crystal is, "The girl who likes you, apparently." A portion of her skirt hem disappears for a second.
  • When Milo, Melissa, and Zack are inside the classroom to get the math book, the stuff on top of the desks changes from one shot to another, and the key disappears in the second shot.
  • Melissa is improperly layered on the background when she reenters the locked classroom.
  • Adrian Pasdar is credited as "Mr. Chase" in this episode, despite the character not appearing in this episode.
  • There were multiple red books on the bookshelf Milo climbed to.
  • Melissa calls her tablet equivalent an "rPad", even though in A Clockwork Origin, it was established that Victor Verliezer created his own tablet equivalent called the "V Tablet", though it is possible that the two are company rivals.



Battle of the Bands
Episodes Next:
The Little Engine That Couldn't