Fiona's bad judgments about Robbie catch up with her. Frank and Sammi make up for missed father-daughter time and Army investigators pay Lip a surprise visit at college.
Principal Perry is in danger and the Lab Rats are at risk of exposing their powers to her and Davenport's business is ruined.
Trent after torturing Leo and Chase becomes the victum of the boys' access to Davenport technology and Bree has a hair cream accident.
When Dr. Evans becomes entrapped in Davenport's secret facility, the team sets out to rescue him for the holidays.
Chase accidentally shrinks Adam when adjusting his strength levels and Bree becomes principal for a day.
The school is woefully behind the times and Davenport upgrades the tech including creating a mechanical Principal Perry which goes haywire after Chase adjusts it's settings.
When Leo's rival claims there's a ghost at the school, he and Chase decide to prank him until they discover it may be true.
When the school mascot costume is stolen by a rival school, Adam kidnaps their llama. Meanwhile Bree and Leo compete against Principal Perry and Caitlyn in dominos.
Adam is tired of not having time off from training, so Eddie convinces him and Leo to make a clone of Adam. Things go awry when the clones self duplicate.
When ultra-super rich Perry Hamilton and son Clayton move into the neighborhood, they make the Davenport family miserable just because they're rich. Perry challenges Donald to a stock car race for the deeds to their houses.moreless
When Adam gets a monster truck, Mr. Davenport doesn't think it is a good idea until he drives it. Unfortunately, he crashes it into the school and now Principal Perry has it.
When a priceless piece of art is missing, the rats must search everywhere to locate it.
Leo and Chase perform magic for the talent show while Bree watches Adam and her boyfriend, Owen, create butter art.
Chase finally succeeds in pranking Adam, causing Adam to get hurt and lose his self confidence.
Fiona starts a new job at an office. Mandy affects Lip's future, while Karen pushes Mandy to the edge. Frank manages to become the public face of a gay rights movement.
When the team is trapped in detention, Leo fills in to help Eddie and Davenport stop a toxic gas leak.
Leo accidentally releases robot flies.
When the rats crave each others bionic abilities, they switch their chips despite warnings from Davenport. When they accidentally trap Leo in an elevator with the principal, they need to learn how to use each others abilities.moreless
The principal introduces "Death Spiral Smackdown" and Leo teams up with Adam expecting him to use his bionics. When he refuses, Leo uses a power-up cereal to force the bionics to activate.
Davenport is afraid of letting Chase go to school since his commando app could glitch and activate. The kids must play the football players when they embarrass them.
After Leo and his mom move into his step dad's house, he accidentally finds a secret lab in the basement with three bionic teenagers.