The Enterprise discovers a planet exactly like Earth, but the only inhabitants are children who contract a fatal disease upon entering puberty.
Episode rating
Cast of episode
- Captain James Tiberius 'Jim' Kirk
- Mister Spock
- Miri
- Jahn
- Dr. McCoy
- Yeoman Rand
- Jahn's Friend
- Barber
- Blonde Girl
- Redheaded Boy
- Galloway
- Farrell
- Little Boy
- Crewman
- Ingenieur Fields
- Little African American Girl
- Boy - Army Helmet
- Lieutenant Leslie
- Flowered Dress Girl
- Little Blonde Girl
- Louise
- Brunette Girl
- Girl in Red-Striped Dress
- Small Boy