Donald and Challon part as Manford Safari Park closes; Donald flies to Madrid for a panda's birth; Haslam and Ethel wed.
Donald and Reilly try to trap an unknown carnivore in a cave; Liz is hospitalized after contact with a poisonous frog.
Ethel considers quitting to marry Haslam; importers offer leopards to the zoo; a female gorilla becomes attached to Reilly.
An elephant and a kangaroo are stolen; someone attempts suicide at the zoo; Haslam proposes to Ethel.
Donald discovers slaughtered animals were used to transport drugs; a keeper overdoses an elephant; Donald treats snakes.
An orangutan with hepatitis bites a girl; Donald artificially inseminates a panda; Donald and Maria enjoy Madrid.
An intruder tries to steal a falcon; two tigers drown; Donald and Challon narrowly escape an accident in the tiger reserve.
Someone tries to destroy Reilly's animals; Donald and Challon argue over the former's treatment of a dolphin.
Maj. Jenks exercises his pet tigers on the golf course; Liz stops schoolboys from abusing an armadillo.
Donald picks up an orangutan; a sick eland charges its keeper; schoolteacher Liz Collier helps Donald retrieve a myna.
Disasters, including a fire, endanger the animals and the park; Maggie tells Donald she is leaving for another job.
A woman claims spirit messages from D.H. Lawrence cured her sick bird and the park's ailing whale.
Dolphin-trainer Sindy arrives to work with the new dolphins; a whale overheats on its journey to the park.
An old man dies in the waiting room; the lions contract a disease, and one of them attacks Donald as he treats them.
Donald strikes up a friendship with a female trainer as Manford Park is readied for the dolphins' arrival.
Locals question park security; an eccentric breaks into the lion enclosure; police want to shoot an escaped lion.
Vandals worry the villagers; Donald accidentally doses himself with a deadly anesthetic; the baboons escape the park.
A ruthless executor appointed to close the zoo plans to shoot all unsold animals; an elephant lies down and refuses to move.
Donald and an undertaker embalm a dog; Donald meets now-divorced Maggie at a dolphin operation in France.
Donald treats an armadillo; vital items missing from the zoo turn up in the camp of a quarantined circus act.
Work on the safari park continues as Webb and Donald's partnership dissolves; Webb considers retirement.
Donald treats an arthritic elephant and an ailing camel, and helps a medic extract blood from a lobster.
Gran Turner undergoes surgery; Donald tracks a wild puma, removes an elephant's tumor and asks Maggie to marry him.
An anesthetic dart-gun proves helpful; Maggie intervenes when a depressed orangutan refuses to relinquish her dead baby.
Donald discovers a local eccentric sharing her medication with a pet monkey; Maggie nurses a lion cub back to health.
Donald uses hypnosis to treat starving alligators; an elephant with too big an appetite gets a stomach ache.
The zoo director asks Donald to supervise the breeding of exotic species; Jenny leaves for a job with a national paper.
Donald, dissatisfied with his work at the zoo, seeks a new job, but an encounter with the tiger he saved changes his mind.
Donald and Jenny spend a weekend together; the zoo may close unless Donald can discover why a camel died of anthrax.
A newspaper story on the elephant's death enrages Donald's boss; Donald successfully treats a poisoned tiger.
An elephant anesthetized for a tooth extraction crushes a lung and dies while Donald and Webb operate on her.
A young veterinary surgeon returning to his hometown learns he must treat exotic animals at the local zoo.