The Invisible Man (1975–1976)

Created by Harve Bennett, this sci-fi adventure series stars David McCallum as a scientist who becomes permanently invisible after an experimental procedure. Blending episodic missions with light espionage elements, the show follows his efforts to use his condition to assist a secret government agency while searching for a cure. Its narrative emphasizes scientific experimentation, covert operations, and the personal challenges of living unseen in a visible world.

Från IMDB:
The weekly adventures of Dr. Daniel Westin, an invisible scientist working as an agent for a private thinktank.