Two chemists at one of Jonathan's subsidiaries (Karen Austin and Paul Rudd) have developed a new hallucinogen, far potent than Angel Dust, and their supervisor finds out but is killed when he tries to report them to Jonathan. But, having spoken to the supervisor's wife, the Harts believe the explosion he was in was no accident, and investigate. Fun aspect is seeing Stefanie donning a wig and going undercover around the lab. In a tense scene, Jonathan gets his coffee spiked with the potent drug and drives. Wagner's acting is excellent, making all those funny faces while he's high as a kite. The physical interplay as Jennifer tries to stop him from crashing the car is great. Another favourite bit is the testing centre where things get cold to hot very suddenly ( living in the Blighty I know that firsthand) for the Harts. A strong and engaging episode.