Leo wants to be a part of the team, but Davenport won't let him. When Davenport discovers a gas leak, he sends a mission alert to Adam, Bree and Chase, but they're stuck in detention with Principal Perry from missing school on their other missions. Leo joins Davenport on the mission instead, much to Davenport's dismay. Leo soon proves to be worthy when he saves the day. In the end Leo is officially a member of the team as someone who watches over the mission and gives ideas/advice. Meanwhile, Davenport gives Eddy a body, which is broken on the mission.
The episode begins when Adam, Bree, Chase and Davenport return from a mission. Leo asks if they used the suggestions that he gave to Davenport, only to discover that the pieces of paper the suggestions were printed on were physically used to clean up a coffee spill. Davenport sends the Rats off to unpack their gear, while Leo talks with Davenport about wanting to be a part of the team. Davenport refuses, but allows Leo to type up the Mission Summary Reports, much to Leo's dismay.
The next day at school, Principal Perry scolds Adam, Bree and Chase for missing school on a consistent basis due to their missions. She gives the Rats detention, while Leo gloats about his freedom. At home, Leo finishes the reports before discovering that Davenport has designed a mobile robot body for Eddy, who sprays fog in Leo's face followed by a fluid that Davenport claims is "mostly water".
In detention, Chase receives an Urgent Mission Alert from Davenport, but the Rats realize that they have almost no ability to escape. At the house, Leo tells Davenport that the Rats are stuck in detention, much to Davenport's dismay. He explains that there is a toxic gas power plant about to explode which could send a highly toxic gas cloud into the Earth's atmosphere. After a failed attempt to contact Principal Perry, Davenport orders Leo to go to detention and ask Perry to release Adam, Bree and Chase. Leo is frustrated that Davenport is taking Eddy on a mission instead of him, so Eddy, with his typical sarcasm says, "Oh, it's nothing personal! He just thinks you're worthless."
Back in detention, the bell rings, which almost frees Adam, Bree and Chase to go help Davenport, but Chase and Bree accidentally say the words "mission" and "gear" aloud, prompting Perry to believe that the three of them are hiding a secret. She begins to interrogate them while Davenport struggles to find out what to do to resolve the toxic gas problem. Leo suggests to turn on the fan to create a wind that will blow away the toxic gas. His plan works, but the wind is too strong and starts to suck up Davenport's gear and Eddy. The deactivation button is not working and they attempt to push harder.
Back at home, Davenport re-installs Eddy, who is disappointed to realize that he has been disconnected from his mobile body. Adam, Bree and Chase finally arrive home, only to discover that Leo has done their work and impressed Davenport. Davenport decides that Leo has what it takes to be on the team and names him Strategic Mission Specialist, gives him his own work station, and allows him to help plan the mission strategies. Later on, it is revealed that Adam actually did not tell Perry about the Rats' bionics, instead he made up an excuse that Leo causes the Rats to keep missing school because he is planning pranks. Leo is frustrated and angry when he realizes this means that he has detention for a month.
In the fictional town of Mission Creek, Leo and his mother, Tasha, move in with billionaire inventor Donald Davenport, Leo's step-father. In a secret underground lab in Davenport's high-tech home, Leo discovers three bionic superhuman teenagers named Chase, Adam, and Bree, known as the Lab Rats. Leo learns they have lived their whole lives in the lab, where they have been training their bionic abilities for future classified missions. Leo secretly takes them to his school, Mission Creek High, where their lack of experience with the outside world causes chaos, in part because their bionics can be inadvertently activated through their emotions. When Davenport finds out, he bans Chase, Adam, and Bree from having contact with the outside world. However, Leo, in appreciation for making him more popular at school, throws a party for Chase, Adam, and Bree in Davenport's house, only to get caught when Davenport and Tasha return home during the festivities.
Because of a mistake by the engineer, Davenport's high-speed bullet freight train speeds out of control toward a town, with enough toxic chemicals onboard to wipe it out. Chase, Adam, and Bree convince Davenport to send them out to stop the train, marking their first mission after years of training. Leo, upset that Davenport will not allow him on the mission, sneaks along by hiding in a bag. However, Chase, Adam, and Bree realize that Leo removed the decelerating device from the bag so he could fit in it. They devise an alternate plan to stop the train and are successful. Meanwhile, Tasha, a local news reporter, gets her first big reporting job by covering the runaway train. However, she and her cameraman have repeated trouble getting the train on camera until it is stopped.
Tasha wins an award for her reporting, but the awards ceremony is on the same night as Leo's birthday. Although she plans for the family to celebrate his birthday on the following night, Leo is convinced that he will actually receive a surprise party on the night of his birthday. When Davenport and Tasha attend the ceremony, Chase, Adam and Bree decide to lock Leo in the lab while they put together a surprise party for him. Chase, Adam and Bree invite several of their favorite entertainers to the party and forget to let Leo out so he can enjoy it, only realizing their mistake after the party ends. To make it up to Leo, they let him try out their mission simulator in which they train their skills against artificial enemies.
Davenport decides to send Adam, Bree and Chase to stop a particle collider before it creates a black hole that will implode the Earth. Future Leo travels seven years into the past to tell Leo and Davenport that Chase, Adam, and Bree will not make it to the future and that the only way to save them is to not let them go on their particle collider mission. Davenport decides to send an automated rover in their place, but Chase, Adam, and Bree go, anyway, since the whole world is in their hands. They successfully stop the particle collider. Leo goes after them and saves their life by pushing them aside when the dome collides, becoming trapped himself. Adam digs up Leo who ended up saving every one of them. Leo misses his date with Janelle which causes Future Leo to end up with a dog instead of Janelle as his bride.
Leo wants to be a part of the team, but Davenport will not let him. When Davenport discovers a gas leak at a facility, he calls Chase, Adam, and Bree, but they are stuck in detention with Principal Perry for missing school during their other missions. Leo goes instead, much to Davenport's dismay. Eddy, who received a full robot body from Davenport, also goes on the mission. Leo soon proves to be worthy when he devises a solution to the gas leak, by sacrificing Eddy's new body. Later, Leo officially becomes a member of the team as someone who watches over missions and gives ideas and advice, and Eddy is returned to his former location within the walls of Davenport's house.
Bree has a crush on Owen, a student who is an artist. While going on a mission to receive samples to bust criminals, Bree is exposed to one of the chemicals that she is collecting when she is not paying attention. Upon learning that Bree is infected, Chase, Adam, and Davenport try to figure out what is wrong and how to undo it. Leo tries to make sure Bree does not reveal her bionics when she sneaks out to see Owen's art at school. At the art show, however, the side effects of the chemical Bree was exposed to begin to manifest, causing her to lose control of her body.
Adam dislocates his arm after Chase pulls a prank on him. After realizing how dangerous the world can be, Adam becomes overly concerned about safety and eventually decides to quit the team to avoid getting hurt again. Chase and Bree realize they cannot go on missions without Adam, so Chase and Davenport come up with a plan that convinces Adam to rejoin the team. Meanwhile, Bree discovers she has a vocal manipulation ability that allows her to copy other people's voices, but she gets grounded for using it to make fun of Principal Perry.
Adam and Bree are always saying that super strength and super speed always make a good team, so Chase tries to prove to them and Davenport that super intelligence can be good on its own. Davenport arranges for Chase, Adam, and Bree to go on a mission in Antarctica to obtain the element needed to power his new freezing gun. He calls off the mission due to a snow storm, but Chase goes, anyway, wanting to prove to Adam and Bree that he can complete a mission by himself. Meanwhile, Leo accidentally freezes Janelle and Tasha with the freezing gun. In Antarctica, Chase ends up getting trapped by an avalanche. He is rescued by Douglas, who presents him with a tempting offer to work together and be given Adam and Bree's bionic abilities. Chase agrees to the offer and brings Douglas to Davenport's lab to carry out the plan, but he then freezes Douglas, stating that he would never betray his family.
On Christmas Eve, Davenport learns that one of his research facilities near the North Pole is experiencing aftershocks following a volcanic eruption. Davenport sends Chase, Adam, and Bree on a mission to save Dr. Evans from the facility. After aiding Dr. Evans in stabilizing several of his machines, an aftershock causes his gammasphere to crack. Chase has to use his force field to contain the highly dangerous gamma rays while Dr. Evans devises a solution to permanently contain the gamma rays, ultimately deciding to implode the facility to contain them. Dr. Evans and the others evacuate the facility before it implodes, and the plan is a success. Meanwhile, Principal Perry stays in Davenport's mansion and makes Christmas miserable for him, Leo, and Tasha. Later, Principal Perry makes up for it by making a beautiful dinner for the family. 781b155fdc