MarsCon is a regional science fiction convention that began in 1990 in Virginia Beach, Virginia. It evolved from an earlier convention called Sci-Con and was established with a focus on providing a relaxed environment for fans to connect and share their interests. The convention's name is a playful nod to a long-standing, fictional bid to host the World Science Fiction Convention on Mars in the year 2095.

Over the years, MarsCon has become recognized as a significant event in the Tidewater area, often described as the largest and longest-running science fiction and fantasy convention there. The event typically features a variety of activities, including panel discussions, workshops, gaming, anime screenings, a dealers' room, and charitable auctions. A consistent element of MarsCon has been its support for the Heritage Humane Society, with significant funds raised annually through various events, particularly auctions.

The convention that would become MarsCon originated as Sci-Con, a well-established general science fiction gathering in Virginia Beach. In 1990, the organizers of Sci-Con decided to host a more low-key event, a "relaxicon," for their members. This experimental gathering proved successful and was subsequently renamed MarsCon. The new name was chosen in honor of a recurring, humorous concept of a fictional bid to host the World Science Fiction Convention on the planet Mars in the distant future of 2095. This origin story imbues MarsCon with a sense of playful, forward-looking imagination, a characteristic that has defined its atmosphere.

MarsCon is designed to foster a relaxed and friendly environment for science fiction enthusiasts. The convention program typically includes a diverse range of activities catering to various fan interests. Attendees can participate in panel discussions and workshops that delve into genre topics, engage in different forms of gaming, including role-playing and card games, and enjoy screenings in the video room, often featuring anime. A dealers' room provides opportunities to purchase merchandise, while events like an annual tea party and a charity auction add to the social and philanthropic aspects of the convention. An art show also showcases creative talent within the community.

A significant aspect of MarsCon's history is its sustained commitment to charitable endeavors, particularly its long-standing support for the Heritage Humane Society. Year after year, the convention has organized auctions and other fundraising activities, contributing substantial amounts to the local animal shelter. For example, MarsCon 2014 raised over $5,000, and subsequent years have also seen thousands of dollars collected. This dedication to giving back highlights the convention's role not only as a fan gathering but also as a community-focused event that leverages its platform for positive social impact.