"The Substitute" is the first segment of the eighth episode of Milo Murphy's Law. It was made available on WatchDisneyXD.com on March 6, 2017, before making its television debut on March 13.
A jaded science substitute teacher, Ms. Baxter, re-discovers her love of teaching after a life-altering day with Milo.
- "Weird Al" Yankovic as Milo Murphy
- Sabrina Carpenter as Melissa Chase
- Mekai Curtis as Zack Underwood
- Leah Remini as Ms. Baxter
- Dan Povenmire as Vinnie Dakota
- Jeff "Swampy" Marsh as Balthazar Cavendish
- Greg Cipes as Mort Schaeffer
- Vincent Martella as Bradley Nicholson
- Chrissie Fit as Amanda Lopez
- Substitute Science Teacher in Space
- April 26, 2017 (Portugal)