gueststar
verbUK /ˈɡɛst stɑː/
US /ˈɡɛst stɑːr/
To guest star means to be a special visitor who acts in a show for a little while.
My favorite singer will guest star on the cartoon this Friday.
OTHER MEANINGS
2. To make a short special appearance in a TV show or movie as a famous visitor.
The old actor agreed to guest star in one episode of the new series.
3. A famous person who appears briefly in a show or event.
The guest star waved to the crowd at the end of the concert.
4. To join a team or group temporarily as a special member.
A retired player will guest star with our soccer team for the charity match.