Fathom is a video game originally released for the Intellivision console in 1983. Developed by Imagic, it can be categorized under the action-adventure genre. The game places players in the role of Neptune, god of the sea, on a quest to rescue the mermaid Tritania. Players navigate through the ocean depths, avoiding or destroying enemies while collecting pieces of Neptune's trident and unlocking the cage holding Tritania. Fathom was known for its colorful graphics and engaging gameplay during its time, offering a unique underwater experience.