cameo appearance; cameo performance
Refers to a brief appearance by a well-known person in a film, TV show, or similar media, often as themselves or in a minor role.
その映画には有名な俳優がカメオ出演している。
A famous actor makes a cameo appearance in that movie.
Compound of カメオ (from English 'cameo') and 出演 (appearance, performance).