Kripke's Lab is filled with machines and experiment that evolve plasma, and an NSA grant funds a micro-controlled plasma experiment in the lab.
In "The Killer Robot Instability" it was only mentioned.
In "The Vengeance Formulation", the lab is seen on Sheldon's webcam where Kripke, Siebert and the Board of Directors get covered with foam that was used to get rid of Kripke for humiliating Sheldon on the radio interview. Sheldon's video appeared on Kripke's computer, telling him that this video is uploaded to YouTube. The Plasma Lab is presumably cleaned up afterwards.