Anime series explore the concept of time travel in various ways, often incorporating elements of science fiction, fantasy, and adventure. Some common themes and approaches include characters traveling to different time periods to change the course of history, exploring the consequences of altering the past, creating alternate timelines, and dealing with the moral implications of time manipulation. Time travel in anime is often used as a plot device to explore complex themes such as fate, destiny, regret, and the butterfly effect. Overall, anime series use time travel to create intriguing and thought-provoking storylines that captivate viewers.