Programmes I Remember That Nobody Else Does: Space Sentinels
The world's mightiest young heroes on a mission to save the Universe!!
Hercules - given the power of superhuman strength.
Mercury - given the ability to run and fly at up to the speed of light.
Astrea - given the ability to morph into nearly any living creature.
Morpheus was the Sentinels' sworn enemy. He was also an Earthling who was given his powers in the same manner as the Space Sentinels, however, he was given a variety of powers rather, but he rebelled and turned to evil.
For those that couldn't understand the back story it was explained at the start of every episode: "Many centuries ago, three carefully selected young Earthlings were transported from their native lands to my faraway world. Here they were granted astounding powers, and eternal youth, then returned to Earth. Their mission: to watch over the human race, helping the good in it to survive and flourish. In the course of history, their names have become legend: Hercules, empowered with the strength of a hundred men. Astrea, able to assume any living form. Mercury, the amazing athlete who can match the speed of light. Working together with me, Sentinel One, and my maintenance robot, Mo, these teenage guardians form the greatest team the world has ever known... The Space Sentinels."
Links: Space Sentinels Intro (mp3)