They are all still alive. The lead singer, Rod Evans, played with Deep Purple and is famous for their song "Hush" from 1968. He got into a conflict with Richie Blackmore and was replaced by Ian Gillian. No one has heard from him or can find him. The bass player, Lee Dorman, is now on tour with Iron Butterfly. He was the bass player on Innagottadavita. the drummer, Bobby Caldewell, was the drummer on Rick Derrengers Rock and Roll hoochie koo. Gary Reinhart(Rhino)is an extermintor in Florida. They were basically a bunch of wastoids that was badly managed.
There first album "Captain Beyond" is classic. Their second " Sufficiantly Breathless" is great. There third comeback album from 1977 " Dawn Explosion" blows.