Literary characters come to life late at night in a bookshop, serenading Sniffles the mouse with swing music until the Frankenstein monster intrudes.
| Actor | Role |
|---|---|
 Mel BlancVarious (voice) (uncredited) | Various (voice) (uncredited) |
| MMargaret Hill-TalbotSniffles (voice) (uncredited) | Sniffles (voice) (uncredited) |
 Cliff NazarroVarious (voice) (uncredited) | Various (voice) (uncredited) |
 Gay SeabrookVarious (voice) (uncredited) | Various (voice) (uncredited) |