Phelix the Helix is a fictional children's book based on four characters: Phelix - a shetland pony, Thunderbolt, Mercury, and Stacks - trained champion racehorses. The story takes place on a racehorse training farm and its central theme is the value of friendship. Phelix the Helix is not the average shetland pony. This shetland pony tale captures Phelix at his best.