"Continuum" is a science fiction film that explores themes of time travel and reality manipulation. The story revolves around a group of scientists who develop a device that allows them to access parallel universes. As they experiment with this technology, they face unforeseen consequences and ethical dilemmas, leading to a struggle for survival as they navigate alternate realities. The film delves into complex concepts of existence, identity, and the impact of choices across different timelines.

"I'll Follow You Down" is a science fiction drama that explores themes of time travel, family, and loss. The film follows a young man, played by Haley Joel Osment, who investigates the mysterious disappearance of his father and delves into the complexities of time travel. Critics have noted its thought-provoking premise and emotional depth, though some found it slow-paced. Overall, if you enjoy contemplative sci-fi with a focus on character development and existential questions, you may find it worthwhile.

Haley Joel Osment's first movie was "Forrest Gump," released in 1994. In this film, he played the role of Young Forrest, the son of the main character, Forrest Gump, portrayed by Tom Hanks. Osment's performance, despite being a small role, garnered attention and helped launch his career in Hollywood. He later gained widespread recognition for his role in "The Sixth Sense" (1999), where he played a boy who can see and communicate with the dead.

"Continuum" is not widely recognized as a specific film, but if you're referring to complex films in general, many critics and audiences often cite titles like "Inception," "Mulholland Drive," or "2001: A Space Odyssey" as some of the most complex movies due to their intricate narratives, non-linear storytelling, and philosophical themes. These films challenge viewers' perceptions of reality and often require multiple viewings to fully understand their layers and nuances. Each has sparked extensive analysis and debate in film circles.