Arcade game from the 80s, ZERO in the title

Hi, I'm wondering if someone can help me. I'm trying to remember the name of an arcade game I played back in the 80s that had the word ZERO in the title. It was kind of like Asteroids and Galaga. Asteroids would come down but when you blew them up they'd become space ships that would attack you. It was a lot of fun. Can anyone help?