C.S. Lewis' Space Trilogy
C.S. Lewis' Space Trilogy is a trilogy of books called Out of the Silent Planet, Perelandra, and That Hideous Strength. The main character of the books is Dr. Elwin Ransom, a philologist, who finds himself in a battle of good vs. evil.
The first in the space trilogy. It introduces the main character, Ransom. While hiking one day he is kidnaped and taken into outer space  He is taken to a planet called Malacandra  where he must be handed over to some strange alien creatures called sorns. He escapes and meets other aliens on the planet called hrossa He eventually goes to see the ruler of Malacandra, Oyarsa. He also meets his captors again and is sent back (freely of his own will) to his own planet. He comes back and according to the story lets a fictional Lewis in on the secret. They decide to publish his time on Malacandra as a fictional novel. 
The second in the space trilogy. It has Ransom sent to Perelandra  to stop an evil that the devil has put into action there. He represents good against evil, which is represented by one of his kidnappers, Professor Weston. He manages to help stop Perelandra from becoming another fallen world. Perelandra ascends to perfection. 
The third and last in the space trilogy. It involves the final battle of good vs. evil. It includes Ransom the least of the three books. It also involves the return of Dick Devine from Out of the Silent Planet as the Lord Feverstone. 
Notes and References
- The kidnappers are Professor Edward Weston, and Dick Devine.
- We learn later it is the planet, Mars.
- There is a third race called pfifltriggi but they aren't in the story much.
- Out of the Silent Planet, by C.S. Lewis, Macmillan publishing, 1965.
- We learn later it is the planet, Venus.
- Perelandra, by C.S. Lewis, Macmillan publishing, 1944.
- That Hideous Strength, by C.S. Lewis, Macmillan publishing, 1946.
- C.S. Lewis Society of California
- Marion E. Wade Center, Wheaton College
- "C. S. Lewis: Science and Scientism," by Henry F. Schaefer III
- "The View from Other Worlds—Seeing Ourselves with God’s Eyes," by Luci Shaw
- "C. S. Lewis on Mere Science," by Michael D. Aeschliman
- C.S. Lewis Foundation
- Into the Wardrobe