He-Man doesn't always gain his strength by lifting his sword and saying "I have the power". Sometimes He-Man has to pump iron at the Eternia Gym. This Masters of the Universe t-shirt shows He-Man lifting weights at Eternia Gym, which was established in 1983, the same year that Masters of the Universe premiered. Over the years, Masters of the Universe has proven to be one of the all-time great animated series, mainly due to its powerful star, He-Man.