In a legal case, the main parties involved typically include the plaintiff and the defendant. The plaintiff is the person or entity who brings the case to court, claiming that they have been wronged or harmed. They seek a legal remedy, such as compensation or an injunction. The defendant, on the other hand, is the individual or organization being accused of wrongdoing. They respond to the allegations made by the plaintiff and may present their own evidence and arguments to defend against the claims. Both parties play crucial roles in the legal process.