Lab Rats - Season 4 - Eps 23: The Vanishing (1)
Donald and Douglas reveal that they have built an upgrade for all the students bionics, except for Leo's. But the upgrade doesn't work on Adam, Bree, and Chase because their systems are older. Adam, Bree, and Chase are therefore left at their level, while all the students are much more powerful. Meanwhile, Daniel is brought to the Academy because he had been using his bionics in the outside world. Douglas decides to enroll Daniel at the Academy, and he makes Leo his mentor. Leo steadily tries to teach Daniel, but Daniel proves to be unteachable, so Leo gives him the upgrade as well. The students steadily start to vanish, including Daniel. Giselle Vickers, Douglas' old girlfriend, is revealed to have captured them. Daniel sends a video message to the Island, requesting help.
About Lab Rats

Title: Lab Rats
First Air Date: 2012-02-27
Last Air Date: 2016-02-03
Status: Ended
Rating: 8.111/10 (from 157 votes)
Language: EN
Seasons: 4
Total Episodes: 96
Network: Disney XD
Genres: Comedy, Sci-Fi & Fantasy, Kids
Production Companies: Walt Disney Television, It's a Laugh Productions
Synopsis
Leo is an ordinary teenager who has moved into a high-tech "smart'' house with his mother, inventor stepfather and Eddy, the computer that runs the house. Leo's life becomes less ordinary when, one day, he discovers a secret underground lab that houses three experiments: superhuman teenagers. The trio -- Adam, the strong one, Bree, the fast one and Chase, the smart one -- convinces Leo and his parents to let them leave their lab and join Leo at school, where they try to fit in while having to manage their unpredictable bionic strengths. As Leo figures out a way to keep his new pals' bionic abilities a secret, they help him build self-confidence.
Cast

William Brent
Chase Davenport

Spencer Boldman
Adam Davenport

Kelli Berglund
Bree Davenport

Tyrel Jackson Williams
Leo Dooley

Hal Sparks
Donald Davenport