The rapid advancement of generative artificial intelligence (AI) and immersive synthetic realities (SR) is reshaping the domain of information warfare. Extremist groups and authoritarian regimes exploit these technologies to manipulate public discourse and erode trust in democratic institutions through propaganda, disinformation, and hate speech. Existing countermeasures, such as algorithmic moderation and content takedowns, often fall short due to their reactive nature, potential biases, and unintended consequences, particularly in SR environments. This project proposes an innovative solution: inoculating individuals against harmful influence campaigns using AI-powered chatbots based on psychological inoculation theory. These chatbots act as “mental vaccines,” engaging users in ethically guided, persuasive dialogues to build cognitive resilience against manipulative narratives.