Brewster delivers some feed to the Safari Park, and hurries back to practice today's task - picking up mail sacks - unaware that he has a monkey stowaway onboard! Back at the depot, someone - or something! - is causing mayhem. Methodical Brewster's questioning mind comes in very handy when he turns detective.

The trainees are learning how to use ice-cream cars today, and will be trying for their Ice-Cream badges. The great Frostini is going to test them on their skills. When Wilson's car breaks down, Puffer Pete comes to the rescue, pulling out his old steam driven ice cream wagon from the back of the rolling stock store - where it has sat for thirty years.

Koko is yearning for adventure - and she just might get it, as today the chuggers are making deliveries out of town. But Vee asks Old Puffer Pete to accompany them - and he's so SLOW. They always have to wait for him to catch up - and he's always letting off those embarrassing bursts of steam! During their travels, they come across a mysterious old spur track. Pete tells them it leads to Old Chuggington, which is now a ghost town. The trainees decide to explore the old town on their own and get helplessly, hopelessly lost. When Wilson accidentally sets off the old Chuggington Central Whistle, Pete puffs his way through the maze of tracks to investigate. He rescues the youngsters and takes them on a fascinating tour of the old town, which he still knows like his own pistons! The trainees realize that Pete isn't such a fuddy duddy after all and there's a lot that they can learn from him.

Eddie lives so far away from Chuggington that he just can't seem to get into work on time. After getting into trouble with Morgan yet again, he decides to sleep at the depot, to be sure to be on time. But Calley's emergency callouts keep him awake all night, and he oversleeps. Late again! Hodge and the trainees try to find a new home for Eddie in Chuggington.

The chuggers are learning to carry passengers comfortably, using dummies specially made to wobble if the ride isn't silky smooth. Dunbar will test them at the end of the day. Koko and Brewster take to it easily, but poor Wilson struggles. He goes off to practise by himself in the park, but things don't go well.

Everyone loves Frostini, the cool Italian ice cream chugger. Wilson wants to be just like him, so he's especially excited to learn that Frostini needs a helper for the school holidays. Brewster and Wilson compete for the position by doing a trial ice cream delivery round. Wilson imitates Frostini, but the children aren't impressed by his over confident attitude.

Brewster is so excited about seeing the new Action Engine movie today at the ride-in movie theatre. But Irving gives him the job of taking tin cans to the foundry for recycling. Brewster worries that he'll never be back in time for the film - unless he can be as speedy as his Super-chugger hero! Brewster charges off and gets caught up in pretending to be his hero.

On her way to see a lamb at the farm, Zephie gets lost! She shouts for help and rings her little bell, but no one hears her. Morgan fits her with a siren so that she can call for help if it ever happens again. Zephie falls in love with her new accessory and can't resist playing with it and setting the siren off - much to the annoyance of the other chuggers.

Twiga the giraffe is going to have a baby! An excited Koko has been given the job of keeping watch overnight, and fetching Dr. Gosling, the vet, if Twiga goes into labour. That night Mtambo (the safari tour guide train) tells Koko all about nocturnal animals. Koko learns how they use their senses to get round in the dark. When Twiga goes into labour, Koko goes to fetch the vet.

Olwin takes every group of new trainees out on an outward bound training course. She teaches them navigating skills to be used in the event of bad weather or emergencies. Brewster, Wilson and Koko are really looking forward to it - until Zephie and Hodge tell them how Nanny Olwin will treat them like babies the whole time! And she does.

Children from Chuggington School are coming to the Safari Park, and Mtambo is training Wilson and Brewster to help out as junior guides. Mtambo tells them it's important to pay close attention to what he tells them about the animals, as they in turn will have to pass on the facts to the children - who will be tested afterwards to see how much they've learned.

Hodge wants to be more independent, but Eddie never lets him do jobs on his own. So when Wilson startles Hodge, causing him to accidentally break a junction box, Hodge decides to deal with it himself. Using the crane, he jams the wires back in and shuts the doors. Easy. But then strange things start happening. Lights and signals stop working, Vee malfunctions and chuggers are sent to the wrong destinations. Hodge and Wilson realize it must have something to do with the box they broke! If Eddie finds out, he'll never trust Hodge to do anything on his own again - but if Hodge doesn't tell him, it could take Eddie days to figure out what's wrong. Hodge finally musters up his courage and confesses. A relieved Eddie fixes the box. Eddie promises he'll let Hodge do more jobs by himself and Hodge promises to tell Eddie straightaway when things go wrong.

Zephie is given the important job of transporting newspaper reporter 'Rag' and photographer 'Snap.' They're doing a story about Morgan's new rail-going cycle, which Zephie isn't happy about. It's her job to take Morgan places! She feels threatened and wonders if she should find a new job. Rag lets her wear his press pass just for fun, and forgets to retrieve it.

The trainees are trying their wheels at pulling rolling stock around an obstacle course. Ambitious Wilson tries the fire wagon. The course seems easy - until Dunbar tells them they have to do it backwards! Wilson goes first, but makes loads of mistakes. Discouraged, he slopes off and bumps into Harrison, who gives him a tip: he should drop down a gear for more control. Great!

Brewster overhears Morgan talking about something going to the scrap yard, and then hears Pete saying how worn out he is. Brewster jumps to the conclusion that it's Pete who's going to the scrap yard! He and the other trainees determine to help Pete by doing all of his work for him. A farce ensues as the trainees rush around doing Pete's work as well as their own.

Old 'Picky Nicky' Inspector Nicholas is coming to conduct Chuggington Depot's annual inspection. The chuggers swing into action getting things ready. Emery has a day off and really wants to help. He bosses everyone about and generally gets in the way. An exasperated Vee sends him to the station to wait for the Inspector. Emery finds a young woman there.

Dunbar and Nurse David from Chuggington Hospital are teaching the trainees how to use the ambulance car. Shouting over the noise of the siren, Dunbar loses his voice. Morgan can't find out what's wrong, but he suggests that Dunbar rest. Inspired by his lesson, Wilson decides to nurse Dunbar. Unfortunately he's a little too attentive, but Dunbar doesn't have any voice to tell him to go away!

Chatsworth has had a very busy day and wants a quick snooze, but everything and everyone conspires to keep him awake. First the trainees are playing loudly in the park - and then Vee calls him out on another long job. Meanwhile, at the quarry, Harrison unknowingly gets some rocks trapped in his engine.

Calley is doing emergency rescue training with the trainees. If they do well, they'll earn a badge. Calley takes them to her underground chamber to show them all of her emergency rolling stock and the computer that tells her when a chugger is in trouble. Then they go out into the country to do some practical exercises. Calley asks Brewster to pretend to rescue Zephie.

The trainees are learning to use the paint wagon. Wilson has trouble concentrating, so while Koko and Brewster learn how to mix colours, Puffer Pete takes Wilson to Old Town for some extra painting tuition. Wilson is great at doing wild, artistic designs, but Pete says he also has to learn how to paint with control. With Pete encouraging him, Wilson does it!

The depot clock is broken, and the schedule is in chaos! Eddie needs to go to Old Town to see if he can borrow a part from the old clock to repair the depot clock. Hodge gives him a lift, as he's taking the chugscan back to the factory because it's spouting gibberish. Meanwhile, Olwin takes the trainees to Old Town, and on the way tells them about the Old Town Mystery Chugger.

Vee announces that the King of Buffertonia is coming for a tour of the Safari Park. Mtambo wants to give the best tour ever, so he does a practice run - with Hodge pretending to be the king. Mtambo is ready to give his royal tour when he learns that the King won't be coming because he has been trapped in a landslide. Mtambo is devastated.

Dunbar has a new training device: a voice-operated storm simulator tunnel, which simulates wind, rain and fog. It's programmed to respond only to Dunbar's voice. Wilson particularly loves battling the wind. Dunbar says that in real conditions, it's best to couple up to another chugger as the added weight gives control.

Puffer Pete's firebox is completely worn out and he can't move without it. It's going to take ages to have a new one made. Until then, Pete is stuck and can't move by himself. Meanwhile the trainees are playing hide and seek in Old Town. Brewster hides in a shed. When he emerges, he's covered in bits of old junk. Koko and Wilson think it's funny!

The trainees are thrilled to be spending the day training with Action Chugger. He puts them through some intensive stamina exercises, but Wilson just wants to get to the bit where they use jetpacks and fly. Action Chugger laughs and tells him that there is much more to being a super chugger than flying. Brewster is the first to have a go on a flight simulator.