This is the first appearance of Hector's sister.
This episode marks the first appearance of Dander on the series.
Episode Title Pun: Oh My God.
Chief Gluteus reveals that he is a muscle cell, which is why he didn't go haywire when the Allergen went on Level 3.
Drix reveals two tricks Dander can do: one is "play dead", and the other is "play Osmosis", where he can morph his face into the form of Ozzy's and mimic him.
A Level 2 Allergen causes a fit of sneezing. Level 3 causes white blood cells to go haywire and attach to the Allergen.
Coincidentally, Hector gets to keep Uno and Drix gets to keep Dander.