As Chase and Tina bond even more, Oliver comes up with the perfect prank to play on him: De-aging him and his girlfriend so that they become little kids with an advanced De-aging machine he tricked Donald into making. Meanwhile, Kaz and Fletcher attempt to reunite the Elite ANT Force - if only the girls would listen!
- William Brent is added to the main cast starting with this episode.
- Some archival footage from Opposite Day was used and dubbed over by William Brent and Ariel Winter when they were De-aged.
- The Lab Rats: Elite Force episode, They Grow Up So Fast, is referred too, but Leo makes no mention of him being there, further supporting that EAF is set in the original timeline with "a few discrepancies."