  We envision deepfake technologies, which synthesize realistic fake images and
videos, will play an important role in the future metaverse. While enhancing
users' immersion and experience with synthesized virtual characters and scenes,
deepfake can cause serious consequences if used for fraud, impersonation, and
dissemination of fake information. In this paper, we introduce the principles,
applications, and risks of deepfake technology, and propose some
countermeasures to help users and developers in the metaverse deal with the
challenges brought by deepfake technologies. Further, we provide an outlook on
the future development of deepfake in the metaverse.
