Logline
An accident with an experimental quantum probability field causes everyone on the USS Enterprise to break uncontrollably into song, but the real danger is that the field is expanding and beginning to impact other ships—allies and enemies alike.
Written by Dana Horgan & Bill Wolkoff
Directed by Dermott Downs
You can also use the episodes they liked to recommend other Trek shows. Someone that likes the zany episodes would probably like TOS or VOY, for example.