The study explores the potential crime and security implications of the metaverse, an emerging technology that combines virtual reality, blockchain, and other advanced technologies to create immersive, extended realities. The authors conducted a nominal group technique (NGT) study, involving a scoping review of existing literature and elicitation exercises with experts from various fields. A total of 30 crime threats were identified, with sexual offenses and crimes against the person rated as the highest future risks due to their high harm, frequency, achievability, and defeatability. The study highlights the need for stakeholders to prioritize these offenses and develop strategies to address them, considering the unique challenges posed by the metaverse's immersive nature and the potential for hyper-mobility and extended interactions. The findings also suggest that place management and guardianship in the metaverse will be crucial for deterring and addressing crimes. The study concludes by discussing potential measures to prepare for and prevent crimes facilitated by the metaverse.The study explores the potential crime and security implications of the metaverse, an emerging technology that combines virtual reality, blockchain, and other advanced technologies to create immersive, extended realities. The authors conducted a nominal group technique (NGT) study, involving a scoping review of existing literature and elicitation exercises with experts from various fields. A total of 30 crime threats were identified, with sexual offenses and crimes against the person rated as the highest future risks due to their high harm, frequency, achievability, and defeatability. The study highlights the need for stakeholders to prioritize these offenses and develop strategies to address them, considering the unique challenges posed by the metaverse's immersive nature and the potential for hyper-mobility and extended interactions. The findings also suggest that place management and guardianship in the metaverse will be crucial for deterring and addressing crimes. The study concludes by discussing potential measures to prepare for and prevent crimes facilitated by the metaverse.