In season 4, Captain Janeway and her crew continue on their journey through space beginning with the conclusion of their encounter with the Borg in "Scorpion, Part 2". Heroism is a major theme throughout the season and the crew demonstrates this quality best in "Nemesis" and "Scientific Method". The dangerous nature of space travel is also highlighted in "Hunters" and "Prey". Formidable opponents are found in "The Killing Game, Part One" and "The Killing Game, Part Two" featuring an alien race known as The Hirogen as well as in "Waking Moment's" featuring an alien race that 'attacks' during the human dream state.