Tebbis was a young Dinaali boy who wanted to be a doctor, but died in 2377 of acute chromoviral disease due to lack of treatment, despite the fact that the medication was available. His patient number was "R-12", and with a low TC he was restricted to Level Red, where he befriended Dr. Voje and The Doctor. He believed music had healing properties. When a doctor was going to recycle a medical scanner, he took it and repaired it.
He was diagnosed with a chromoviral infection, and originally did not get the medicine needed. When The Doctor smuggled medicine in, his condition began improving, but he died of a secondary infection that spread rapidly. He did not receive treatment for the infection because he had already used up his allocation. (VOY: "Critical Care")