Air date: February 19th, 2019 (UK)
While working in the Australian rainforest, Thomas meets a ranger who tells him about all the animals that live there. He also gets a chance to be very useful when he warns her that a bush fire is approaching and helps her to rescue the koalas, who are too slow to get to safety on their own.
- Advertised Extra: Banjo the koala is included in the episode's title, even though he's not the main character of the episode.
- Ambiguous Syntax: When Ranger Jill tells Thomas that freshwater crocodiles don't eat trains.Ranger Jill: Calm down, Thomas! Crocodiles dont eat trains, especially baby ones!Thomas: Im not a baby train!Ranger Jill: I mean baby crocodiles, Thomas!
- An Aesop: Animals should be protected and respected.
- Call-Back: In the And Knowing Is Half the Battle segment, Thomas recalls the events of "Philip's Number" and "Diesel and the Ducklings".
- Character Name and the Noun Phrase: The way the episode's title is structured.
- Cuteness Proximity: Thomas thinks that the baby crocodile is adorable, when it hatches.
- Egg MacGuffin: Ranger Jill collects a crocodile egg, and at the end of the episode, it hatches.
- Funny Animal: Some crocodiles with human-like qualities that wear clothing appear in the Imagine Spot.
- I Am Not Weasel: Thomas calls the koala a bear, even though koalas technically aren't bears. But to be fair, Thomas had never seen one before.
- Imagine Spot: Thomas has one where all the humans on Sodor have turned into crocodiles.
- Incredibly Lame Pun: "It's the Fat Croc-troller!".note
- Jungles Sound Like Kookaburras: This episode takes place in the rainforest, and kookaburra sound effects can be heard.
- Never Smile at a Crocodile: Thomas is scared of crocodiles at first, but Ranger Jill tells him that freshwater crocodiles don't eat trains.
- One Steve Limit: The baby crocodile that hatches at the end of the episode is named after Thomas.
- Ranger: Ranger Jill, who is a forest ranger who knows all about wildlife and helps save them.
- Seldom-Seen Species: The Kuranda tree frog, a highly endangered type of frog that is featured in the beginning of the episode.
- The Smart Girl: The episode features Tamika, who is very knowledgable about Australian wildlife and is easily the smartest of all the new characters introduced in season 22.
- Soapbox Sadie: Tamika clearly advocates for the protection of wildlife, as does Ranger Jill.
- Speaks Fluent Animal: Ranger Jill knows how to communicate with kookaburras and imitate their sound.
- What the Hell, Hero?: Tamika reprimands Thomas for whistling at the koala and scaring it.