 The original TV series theme by Alexander Courage (qv) can be  heard briefly during Kirks log entry after Spock rejoins the crew.  Except for the opening fanfare which became a regular part of later  Trek films and a small excerpt heard at the end of  _Star Trek III: The Search for Spock (1984)_ (qv), and a significant  reference toward the end of  _Star Trek IV: The Voyage Home (1986)_ (qv), this is the only time  in the film series that the television theme is heard in a major  fashion.