Lion Around (1955)

Richard the Lion escapes from the zoo, and after initially scaring Gumby and Pokey, he convinces them to show him the world. Google Books.

Robot Rumpus (1955)

Gumby uses toy robots to do his household chores on Saturdays, but they go haywire. Mystery Science Theater 3000 puts that episode into The Screaming Skull. GumbyWiki.

The Fantastic Farmer (1955)

Gumby goes to Farmer Glenn’s Ranch to help Pokey. His crops are not growing properly, so Gumby helps in every way he can and finally divides himself into a lot of Gumbys, which go over the fields with many different farm machines. It turns out that the wild growth of the crops is the result of a gopher who In order to feed his large, hungry family, injects roots of corn plants with a chemical that makes them grow into giant ears and roots. Gumby solves the problem by inventing a root machine that makes tasty roots out of weeds. GumbyWiki.

The Little Lost Pony (1955)

The episode in which Gumby first meets Pokey. With the promise of a reward of 100 free ice cream cones, Gumby heads off in search of the missing red pony Pokey. Gumby finds Pokey with his hoof caught in a railroad track. Rushing to the rescue, Gumby manages to free Pokey a moment before the train goes by. GumbyWorld.