Arthur Malencon was the hydraulics specialist of the terraforming station Velara Base on the planet Velara III. He was assigned, with three other terraformers, to this station by Terraform Command in 2360. Lieutenant Commander Data believed that the efficiency of Malencon's hydraulic landscaping was elegant.
Within a year of his death, Malencon became disturbed by the fact that there were erratic power surges in many of the servomechanisms in his hydraulic probes. His first thought was that it had something to do with the increased conductivity from the high saline content. It was actually caused by the microbrain lifeform, which the terraformers discovered, and kept secret.
In 2364, when the crew of the USS Enterprise-D visited, Malencon was at first guarded and secretive, but later almost opened up to them. The project director, Kurt Mandl, sent Malencon to his hydraulics chamber, hoping that he could get the hydraulic probes back on-line. Malencon was killed by a laser drill while working in the hydraulics chamber soon afterward.