As of July 2026, Lab Rats Season 4 aired in 2015 with 24 episodes — streaming now on Disney Plus. Full episode guide and where to watch below.
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Lab Rats Season 4

2015 24 Episodes Comedy · Sci-Fi & Fantasy ⭐ 8/10

Right now you can watch Lab Rats Season 4 on and — and it is funnier than its reputation suggests. The show says what it needs to say in a single season, no filler. 174 viewers have already rated it on TMDB — the kind of consensus that does not happen by accident. William Brent is the obvious draw, but the whole ensemble earns its laughs. Put it on tonight and see for yourself.

Part of the current wave of titles people are actually watching, Lab Rats Season 4 earns its spot. Lab Rats Season 4 does what great comedies rarely manage — it is actually funny, consistently, across the whole run. The fourth season of Lab Rats has a new story location – Davenport’s Bionic Academy, a training facility on a remote island that brings higher stakes and over-the-top missions for Leo and his super-human step-siblings, Chase, Adam and Bree – and a new series title, “Lab Rats: Bionic Island.” William Brent and Spencer Boldman lead a cast that brings real weight to the material. It was aired in 2015. The real test of any comedy is whether it is still funny once you know all the jokes, and Lab Rats Season 4 holds up on rewatch in a way that separates it from one-off curiosities. It rarely drops the ball, and when it does, it recovers fast.

Lab Rats Season 4 is the kind of thing you put on in the background and end up fully watching. It has built its own audience without needing a direct comparison. The complete run is available and best experienced without too much prior knowledge of where it goes. William Brent anchors an ensemble with real chemistry. Genuinely funny, consistently, across the whole run.

📡 Where to Watch Lab Rats Season 4

🇦🇺 Australia
🇺🇸 United States
🇬🇧 United Kingdom
🇨🇦 Canada
🇳🇿 New Zealand
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🎬 Lab Rats Season 4 — Episode Guide

E1
Bionic Rebellion (1)
2015-03-18
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 revenge, but Leo manages to convince Spin and Bob to help him, and, in the end, Sebastian is defeated, his rebellion is b...
E2
Bionic Rebellion (2)
2015-03-18
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 revenge, but Leo manages to convince Spin and Bob to help him, and, in the end, Sebastian is defeated, his rebellion is b...
E3
Left Behind
2015-03-25
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, Donald tries on Chase's mission suit and he and Leo scramble to get it off before Chase gets home.
E4
Under Siege
2015-04-01
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 because Douglas never gave Leo a capsule.
E5
Bionic Dog
2015-04-08
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 be allergic to dogs as he starts sneezing, so Douglas says that Otis has to leave, but he and Adam actually hide the d...
E6
Mission Mania
2015-04-15
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 gets put in charge to develop a new technology for the academy, but can only come up with things that can hurt the stude...
E7
Simulation Manipulation
2015-04-22
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 Chase's group fails at defeating the exoskeleton and defusing a virtual bomb, Chase decides to find a way to cheat and wi...
E8
Forbidden Hero
2015-07-01
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, but he disobeys her and goes on a mission with the rest of the team. When Tasha finds out, she kicks Leo off the team an...
E9
Spider Island
2015-07-08
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 given to it by Douglas. Everyone tries to stop the spider so they can create a cure for Adam.
E10
Spike vs. Spikette
2015-07-15
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 starts fighting with Adam, she activates her Commando App and thinks Chase is her baby. While she destroys the bionic a...
E11
Lab Rats vs. Mighty Med
2015-07-22
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 without his approval. Meanwhile, Kaz comes to the bionic academy to get powers, bringing Oliver with him.
E12
Space Elevator
2015-07-29
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 elevator, Chase immediately gets jealous. Donald then makes Chase Dr. Ryan's assistant. Dr. Ryan puts Chase in charge of s...
E13
Bionic Action Hero (1)
2015-08-05
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-and-coming actor named Troy West. Giselle and Troy visit the island to learn about the bionic team.
E14
Bionic Action Hero (2)
2015-08-05
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-and-coming actor named Troy West. Giselle and Troy visit the island to learn about the bionic team.
E15
One of Us
2015-08-12
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 unexpectedly and shocks everyone. She came to the island because, like everyone else, her memory is blank, but has continuin...
E16
Bob Zombie
2015-09-30
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, Perry made the island officially her own, which makes Bree and Leo angry at her.
E17
Human Eddy
2015-10-14
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.
E18
The Curse of the Screaming Skull
2015-10-21
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 away with Davenport to a museum. Perry says she's going to another island across from theirs, but Douglas says no becau...
E19
On the Edge
2015-11-11
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 only for the original members. Disappointed, Leo forms his own team with S-1, who calls herself Taylor now, and Logan.
E20
Ultimate Tailgate Challenge
2015-12-02
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 college that Perry went to) and Perry arrives stating that she has been trying to score tickets for weeks but it was so...

🎭 Cast of Lab Rats Season 4

William Brent
William Brent
Chase Davenport
Spencer Boldman
Spencer Boldman
Adam Davenport
Kelli Berglund
Kelli Berglund
Bree Davenport
Tyrel Jackson Williams
Tyrel Jackson Williams
Leo Dooley
Hal Sparks
Hal Sparks
Donald Davenport

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