Prisoners of the Poison Sea (Escape from Planet Alcatraz)

Captured by the sadistic guards of the prison planet Alcatraz, the two teenage friends, Zak, and the alien Erro, are placed in bottomless cages hovering over a sea of poison acid and if they fall asleep or lose their grip they will fall to their deaths--and Zak will need all of his ingenuity if he is going to figure out a way to save himself and his friend.