Even superheroes weren't strong enough to resist the '70s disco craze, as you can clearly see in this 1979 clip from Brazil's Programa Carlos Imperial.
Skinny disco versions of Superman, Batman, Sort-of Spider-Man, Thor and -- is that Shang-Chi, Master of Kung-Fu?! -- all took some time off from fighting baddies to get down to a song about being Super Amigos.
I guess Batman and Robin can't be that embarrassed -- they did gi