Walter Reinhardt was born in Salzberg, Austria in 1542. He became Immortal in the year 1579, when he was killed in a duel over a bad debt. He was mentored by the Immortal, Albert Munte.

He became a nemesis to Duncan MacLeod for over two centuries. Their first encounter took place outside of Dover, Kent, in Great Britain in 1728. He had stopped the coach Duncan was in to rob its passengers. After sensing another Immortal, Duncan promptly challenged him. The fight, however, proved indecisive. Not much more is known about their rivalry except that they did encounter one another again around the 1890's, when Reinhardt shared his views on women with Duncan: interchangeable.

Not much more is known about their rivalry except that they did encounter one another again around the 1890's, when Reinhardt shared his views on women with Duncan: interchangeable. The two would cross swords again in 1988. At the time, Reinhardt was a ruthless businessman on Wall Street and a CEO of a major company, however, he was indicted for embezzling money from people including a major pharmaceutical company. Soon The SEC and the F.B.I were ready to arrest him. To avoid going to jail, he faked his death. Reinhardt challenged Duncan and they fought during a New Year's Eve party. It was then that Reinhardt jumped from the rooftop and into the water below and disappeared. Everybody thought Reinhardt died in 1988. I mean everybody, the press, his girlfriend, even The Watchers.