Gemini Man(1976)

Gemini Man is a spy series centered on Sam Casey, an agent for INTERSECT, a covert government operations center. After exposure to radiation during an underwater explosion, Casey becomes invisible—a side effect that transforms him into an invaluable operative. INTERSECT equips him with a computerized watch that keeps him visible during missions, though he can deactivate it to turn invisible for tactical advantage. There's a deadly catch: he can only remain invisible for 15 minutes within any 24-hour period, or the exposure will kill him. This constraint forces Casey to use his extraordinary ability strategically as he undertakes dangerous classified assignments, balancing the power of invisibility against the constant threat of his own mortality.