Four bus mechanics and a stowaway travel Europe as a hotel, picking up singers. In Athens, the stowaway's mother has them arrested for kidnapping but then accepts her daughter's love for a mechanic and they vacation in Greece.
Youths must raise £1500 to save youth club from demolition by unscrupulous developer. They record song, broadcast it via pirate radio as "Mystery Singer" ploy to raise funds. Main character has secret he can't share with girlfriend.
A group of (literally) drifting popsters find themselves involved in a grim sand-and-sandals desert movie. They reckon a few song-and-dance numbers would liven things up.