Everybody knows one or two heroes from Greek mythology; some fans know virtually all of them. Their legendary fights and deeds became a part of the modern culture, appearing in various movies, TV shows, musicals, and songs. But what makes a hero if not his fights against fierce monsters. Fortunately, Greek mythology is full of the most mismatched, hideous and dangerous creatures. Some of them are well-known, some stay in the shadows. Let us remember the most terrifying of them.