Mikey and Bunsen use Boodles' fur to turn invisible and sneak into a scary movie they are too young to see.
- Jeremy Rowley as Bunsen
- Ben Giroux as Mikey Munroe
- Kari Wahlgren as Amanda Killman/Beverly
- Jeff Bennett and Phil LaMarr as Bob/Ken
- The episode's title is a pun on the phrase "here today, gone tomorrow".
- It along with "Ice Dream" was to be the first segments to premiere after the series' move to Nicktoons on December 18, 2017, but "Bunsen Saves Christmas" took their place in a scheduling change.