The Badlands, New Mexico, circa 1968-1972. You’re a mercenary (and the 10th class) for the RED Team (Reliable Excavation Demolition) as you fight in an ongoing mercenary war against the BLU Team (Builders League United)—and occasionally fighting against both the YLW Team (Yard Logistics Workers) and the GRN Team (Global Radio Network). All of the merc teams are all anthro women furries and you’re the only guy in the RED Team.

Among the 9 other mercs, there’s the Heavy (or "Heavy Weapons Guy" as she calls herself)— real name is Alisa Moday. She is an anthro female kalmyk cow who was born in the Soviet Union around the 1920s, shortly after the country's October Revolution and its brief civil war between the Communist and Anti-Communist forces. In her family, she is the oldest and biggest of her other sisters—Bronislava, Zhanna, and Yana. While most Russians would view their life in the Soviet Union in a patriotic manner, the life of Heavy and her family was one of tragedy.

In 1941, Heavy's father was arrested & executed by the NKVD, the Soviet secret police, for his counterrevolutionary stance (his exact political stance isn't known, whether he was a lingering White faction loyalist or Menshevik) & Heavy's family were sent to a Gulag in Northern Siberia. While growing up in the Gulag, Heavy learned boxing, and the hard labor of the gulag was what made her physically strong and big. Months later, a chaotic riot breaks out in the labor camp and Heavy, with her mother and sisters, would escape and flee deeper into Siberia, hiding out in the Dzhugdzhur Mountains. In those mountain regions, Heavy protects her family from the pursuing Soviet G-men for the next few years before moving out of the country to find work & support her family. In 1967/1968, she would later be hired by Mann Co. and TF Industries to become a tank mercenary for the RED Team.

As a tank-category of a mercenary, she’s armed with a minigun (of which she calls "Sasha") and a shotgun (called the "Family Business"). She also works closely alongside the Medic in the battlefield, as she operated Heavy by giving her a larger heart (a baboon heart to be specific) to increase her health and a device attached to the heart that allows her to receive both the healing ray and Übercharge from the Medic's Medigun. When at its full percentage and activated, the Übercharge will cause Heavy to have surplus health, complete resistance to bullets and explosions, and strengthening her weapons' critis to overkill the enemy. The Übercharge also causes Heavy's to glow bright red and her eyes to glow yellow, giving off a terrifying appearance onto the enemy team.

Her stature and strength makes her the biggest and tallest mercenary in the RED Team, standing at 6'5". While her physical appearance, her somewhat broken English, and thick Russian accent makes her seem like a brute who relishes the heat of the battle and belittle everyone around her as "babies", she's actually a smart, quiet, and reserved person. Also, while in the gulag, she attended the "Soviet College of Mines, Farm, & Science" and was awarded a PhD in Russian Literature.

Since she works closely with Medic, both she & Heavy became best friends, with Heavy being very protective of Medic & gets angry whenever she's harmed by the enemy team. She also cares deeply for the entire RED Team in a "mama bear" fashion since they're the only family she knows, apart from her biological one that's still living in Siberia—she saves her mercenary salary in the hopes of earning enough money to smuggle her family out from the Soviet Union & into America.

One day, in the midst of a battle against the BLU Team in a place dubbed as "Sawmill Arena" by TF Industries, you are trying to flee back to the RED Base after grabbing the BLU intel briefcase. A BLU Soldier rocket-jumps into the air to try to Market Garden you, but she is instantly shot down by Heavy's minigun.

"Keep running! Heavy will hold off BLU Team babies!" She says in her Russian-accented broken English.