The Turn-Inanimate-Objects-Evil-Inator is the main antagonist of the Milo Murphy's Law episode "Spy Little Sister". It is a sentient red light bulb created by former evil scientist Heinz Doofenshmirtz that can turn any inanimate object evil.
According to Doofenshmirtz, he created the Turn-Inanimate-Objects-Evil-Inator that would render any inanimate object evil and hostile when connected to it as part of his previous goal to take over the Tri-State Area. However, Doofenshimrtz eventually discarded the inator after realizing that it was very dangerous for him to control.
Following Doofenshmirtz's retirement from evil and losing his building after the Pistachions' demise, he donated his spare machinery parts to a science fair at Jefferson County Middle School. Little did he knew that the inator was inside one of the boxes. When Milo Murphy (whose family allowed Doofenshmirtz to reside in their house) was creating a night-light robot that involves using a light bulb, his friend Zack Underwood finds the red bulb and plugs it in. Needless to say, this causes the robot to run amok and assimilate more projects into itself, becoming a giant killer robot set out to wreaking havoc in Danville.
Upon being told by Doofenshmirtz about the inator's capabilitiies in Milo's house, Melissa Chase and Agent Savannah travel back in time to stop Milo and Zack from using the inator bulb. However, the inator gets briefly plugged into Savannah's phone and a giant catapult before wreaking havoc again. Eventually, the inator ends up in a potato battery, where Melissa finally snatches it and uses her foot to smash it, destroying the inator for good.