Captain Scarlet and the Mysterons

Set in 2068, the series follows the hostilities between Earth and a race of Martians known as the Mysterons. After their city on Mars is attacked by human astronauts due to a misunderstanding, the vengeful Mysterons declare war on Earth, initiating a succession of reprisal attacks that are countered by Spectrum, a worldwide security organisation. Spectrum boasts the extraordinary abilities of its foremost agent, Captain Scarlet, who in the events of the "pilot episode" comes to possess the Mysteron healing power of "retro-metabolism" – the ability to return to full health, even after suffering fatal injury, which renders Scarlet essentially "indestructible".
Source: 
TV