To make time for their band, Bunsen clones Mikey so his clones can run all of his after school clubs.
- Jeremy Rowley as Bunsen
- Ben Giroux as Mikey Munroe
- Kari Wahlgren as Amanda Killman
- Cheri Oteri as Miss Flap
- "Mikey-plication" is a pun on the word multiplication.
- The episode's title card is reused from "Tooth or Consequences", although the difference is that a background pattern is used (of multiple Mikeys).