Lab Rats: Season 4
Season 4 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Directly follows the overarching narrative developments of Lab Rats Season 3.
- Faction dynamics and core character alliances shift under escalating external stakes.
- Crucial mysteries introduced previously reach key turning points and narrative reckonings.
- Sets up serialized story arcs that build directly toward the climactic season finale.
Episode Guide
Season 4 Progress Shield
Bionic Rebellion (1)
Mar 18, 2015
Sebastian has secretly formed an evil rebellion to get revenge on the Lab Rats for destroying his father. Meanwhile, Leo is trapped with the other bionic people who also want rev
Bionic Rebellion (2)
Mar 18, 2015
Sebastian has secretly formed an evil rebellion to get revenge on the Lab Rats for destroying his father. Meanwhile, Leo is trapped with the other bionic people who also want rev
Left Behind
Mar 25, 2015
After sneaking some students off the island and to the mainland, the Lab Rats accidentally leave Spin and Bob behind and must retrieve them before Donald finds out. Meanwhile, Do
Under Siege
Apr 1, 2015
When suspicious events happen overnight on the bionic island, everyone is convinced a new threat has emerged. However, this threat is revealed to be Leo, when his bionics glitch
Bionic Dog
Apr 8, 2015
Adam brings a dog back to the island and Douglas reveals that it's his old dog, Otis, who Douglas made bionic in order to save his life when Otis was injured. Chase turns out to
Mission Mania
Apr 15, 2015
The Lab Rats are on a mission to save people from a wildfire; when the people start to chant Adam, Bree, and Chase's names, Leo gets jealous and wants to become known. Douglas ge
Simulation Manipulation
Apr 22, 2015
Adam and Chase each lead their own student groups against each other in a series of simulated exercises that will evaluate both student and mentor performance. However, after Cha
Forbidden Hero
Jul 1, 2015
When Leo is injured during a mission, Tasha rushes to the academy to take care of him. After finding out what happens on missions, she bans Leo from joining any more missions, bu
Spider Island
Jul 8, 2015
Chase and Douglas reanimate a prehistoric sea spider. It escapes and bites Adam, which poisons him. It then grows and becomes 50 feet long due to growth hormones that had been gi
Spike vs. Spikette
Jul 15, 2015
Douglas finds out that there is a student named Kate with the Commando App. Chase tries to activate her Commando App, named Spikette by Douglas, so he can research her. When he s
Lab Rats vs. Mighty Med
Jul 22, 2015
Chase and Donald have invented a new technology that takes in energy from any environment. Chase feels that he does not get his share of spotlight when Donald sells the product w
Space Elevator
Jul 29, 2015
Donald's top scientist, Dr. Ryan, arrives to test Chase's invention. The two of them dislike each other and don't get along. When Donald puts Dr. Ryan in charge of the space elev
Bionic Action Hero (1)
Aug 5, 2015
Douglas tells the group that his old college ex-girlfriend, a film director named Giselle, will be making a film titled Bionic Action Hero based on all of them and starring an up
Bionic Action Hero (2)
Aug 5, 2015
Douglas tells the group that his old college ex-girlfriend, a film director named Giselle, will be making a film titled Bionic Action Hero based on all of them and starring an up
One of Us
Aug 12, 2015
Adam, Bree, and Chase are looking for Leo because he is late for training and find out he is in Mission Creek because Janelle threatened to break up with him. S-1 shows up unexpe
Bob Zombie
Sep 30, 2015
Douglas creates a device that makes any bionic human as smart as Chase. After Douglas tests it on Bob, Bob starts spending time with Chase. This leaves Adam in envy. Meanwhile, P
Human Eddy
Oct 14, 2015
Donald gives Eddy a human body and replaces his disrespectful personality to make him nicer. Perry restores his old personality, and he attempts to harm the students.
The Curse of the Screaming Skull
Oct 21, 2015
Leo just finishes his movie marathon while everyone else is frustrated because they have nothing to do on Halloween. Bob intentionally stays behind while the other students are a
On the Edge
Nov 11, 2015
Donald tells the group that the president has decided to host an award ceremony because they have completed their one-thousandth mission and Leo wants his recognition, but it's o
Ultimate Tailgate Challenge
Dec 2, 2015
Tasha arrives on the Bionic Island informing everyone that she has tickets to a big football game of the Pioneers (mascot of a college that she went to) vs Vikings (mascot of a c
And Then There Were Four
Jan 13, 2016
Everyone is shocked when Douglas introduces a fourth bionic sibling named Daniel who’s been living a normal life with an adopted family. Daniel later comes to the academy to meet
Space Colony
Jan 20, 2016
In the middle of a massive heat wave, the whole family is going to space to see Donald's space colony, called "Davenportia". Adam annoys Chase while Chase tries to give his safet
The Vanishing (1)
Feb 3, 2016
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 syst
The Vanishing (2)
Feb 3, 2016
Giselle reveals she dug up Marcus from Douglas' old lair and rebuilt him, piece-by-piece. Marcus wants revenge on Douglas for leaving him to die. Everyone rushes Giselle and Marc