Edmond Hamilton 
Planets in Peril 

They were the first arrivals from the other side of the cosmos.With the help of the Martian scientist Thrin, they had crossed the whirling black abyss of the fourth dimension — a dimension that had never been reached before!Now a man with skin of pure marble-white and a woman of unearthly beauty stood before the disbelieving eyes of Captain Future and the Futuremen. The strange couple stared back in awe and amazement — particularly at Captain Future."Here is the one, " the man said finally in his alien tongue. "He is the only one who can save us!"