I was born in 84 and I remember an old movie, it might have been a series, that was about a group of kids who woke up on a spaceship and I think the parents didn’t make it so it’s just the kids. They have adventures including going to a planet (or another ship?) where people would fight in an arena with wristbands that would glow and shoot out when they put their arm out. I remember they find an adult (I remember he had black hair) who tries to help them out and he fights for his life in the arena against the armband person… That’s really all I remember.