C S Lewis and That Hideous Strength

One day, the other planets came to earth to deal with the evil that lurked within our own. Lewis finished his science-fiction trilogy with a hard-edged satire on university politics, mixed with spiritual warfare. Mark the half-hearted gives in to political persuasion of the wrong kind. Jane the resolute refuses to believe in God but falls in love instead. Mr Bultitude the bear finds something deliciously hot, bloody and crunchy to eat. Merlin is woken for his Dark Ages magic, which brings chaos to the right places, and evil is crushed. It's stronger stuff than Narnia. For those who want more moral oomph from fantasy fiction.