The episode picks up immediately after the academy students vanish following a supposed "operating system upgrade". We quickly learn this was the work of , who has rebuilt Marcus , Douglas's android son, piece-by-piece.

The episode concludes with the original team heading their separate ways. Adam and Leo return to the bionic academy to mentor new students, while Bree and Chase join Donald and Douglas to start a new mission—setting the stage for the spinoff, Lab Rats: Elite Force . Character Highlights & Nostalgia

This finale was a love letter to long-time fans. Seeing return provided a perfect full-circle moment for Douglas, who had to face the literal ghost of his past.

The of the strongest bionic abilities in the series The Vanishing 2/3 | Lab Rats | Disney XD

Giselle captures Donald and Douglas, forcing them to watch as their bionic creations—Adam, Bree, Chase, Leo, and the academy students—suffer in an induction chamber.