Like my dad always says, all's well that ends with a Sentient Blob making a teacher remember why she loves teaching.


"The Substitute"
The Sub
Production code: 110a
Broadcast order: 15
Written by:
Jim Bernstein
Storyboards by:
Edward Rivera
Directed by:
Robert F. Hughes
Broadcast Information
U.S. Premiere:
March 13, 2017
International Premieres:
see below
Paired with
"Time Out"
Story arc(s)
"Missing Milo"

The Substitute is the 15th episode in the first season of Milo Murphy's Law.

Episode Synopsis

A jaded science substitute teacher, Ms. Baxter, re-discovers her love of teaching after a life-altering day with Milo.


Ms. Murawski's class is taken over by Ms. Baxter, a disillusioned substitute who finds no fulfillment in her job as she has no way of knowing if her students ever learn anything from her. Milo soon volunteers to help out, only for a simple science experiment to turn hazardous due to Murphy's Law. Meanwhile, Balthazar Cavendish and Vinnie Dakota end up in the classroom closet on their way to bring pistachio plant fertilizer from the future to a sapling. However, their Quantum Localizer loses power, and they are forced to plug it in to charge; Ms. Baxter then ends up getting a hold of it and being transported briefly into space.

After Milo takes over the class, an accident with a spilled chemical and the fertilizer - which Milo grabs thinking it's chemical absorbent - results in the creation of a sentient blob that attacks the students, Ms. Baxter, and the two time travelers. However, Ms. Baxter's lesson on the phases of matter inspires Milo, who works together with his friends to turn most of the gelatinous being into a harmless solid. Dakota and Cavendish are able to save a pistachio sapling from Diogee only for Cavendish to step on it, while Ms. Baxter is thrilled that she actually managed to teach something to her class. However, a sole surviving portion of the blob finds and revitalizes the crushed pistachio seedling, with its leaves turning red and emitting an ominous glow.


For a full transcript of "The Substitute", click here.

Diogee, Go Home!

(In the courtyard Diogee wanders up to the pistachio plant and prepares to pee on it)
Cavendish: Up! Dwup! Yup! No no no no no! Get out of here you beast!
(Cavendish shoos Diogee away)



The Sub gallery
The image gallery for The Substitute may be viewed here.


International Airings

  • March 24, 2017 (Disney Channel Latin America)
  • April 30, 2017 (Disney Channel Japan)
  • June 23, 2017 (Southeast Asia)
  • August 7, 2017 (Disney Channel Israel)


  • The marquee in front of Jefferson County Middle School says "Have fun in Hawaii Mrs. Murawski, your desk will miss you!", indicating that Mrs. Murawski is staying in Hawaii for vacation.
  • This is the first time Diogee interacts with Cavendish and Dakota.
  • This is the first episode to feature any Phineas and Ferb Characters.


  • When Milo shows his glasses which looks like he has "puppy dog eyes", Chad's hair color is different.
  • When the class is seen panicking over Zack's chemical spill, Joni's pupils are white instead of black.





Episodes Next:
Time Out