4x5 - Lab Rats

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 dog. Meanwhile, Leo gets a new smartphone application assistant named Shelly, with whom he has fallen in love. Bree finds out and tells Leo how unhealthy it is. When Leo leaves, Bree tries to delete Shelley, but accidentally changes the settings from Shelley to Liam and is soon seduced by him. Leo hears Liam talking and realizes that Bree changed Shelly into Liam, and gets mad. Suddenly, there is an explosion in the weapons storage area and Douglas is injured. Adam, Chase, and Otis go to the weapons storage area and help Douglas up and Chase finds a tripwire. Chase goes to review the footage of the weapons storage area and shows Douglas and Adam that it was Otis who set the tripwire. Douglas and Adam don't believe him at first, saying that Chase is jealous of Otis and made the footage up. After a while, Otis goes to Adam and activates his Override App, which makes Otis able to control Adam. Douglas and Chase try to stop Adam from acting crazy. When Otis starts shooting heat rays from his eyes at Douglas and acting hostile, Chase scans Otis' bionic chip and tells Douglas that he has an override ability. Douglas says it must have been Krane who reprogrammed Otis to destroy Douglas after he betrayed Krane.Douglas is able to extract the chip from Otis. Bree and Leo come out of a room still fighting and they accidentally drop the phone. Otis pees on the phone, which short circuits it and causes Bree and Leo to stop fighting and walk away from the phone.