One by One - Season 3 Episode 9 Down Below
Liz is inadvertently poisoned by a number of poison arrow tree frogs that have been sent to the zoo instead of normal tree frogs. Paddy is devastated that he didn't check them first. Donald is called out what appears to be a Coypu at some local caves but instead turns out to be an Alligator.
- Genre: Drama
- Studio: BBC One
- Keyword: zoo, veterinarian, based on memoir or autobiography, 1950s
- Cast: James Ellis
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