Wasabi makes plans to marry the mermaid Siren Sung (who Chuckie Chan has a crush on), and soon decides to flood Wasabi World (and rename it Wasabi Water World). Now it's up to the Chooks to stop the wedding arrangements or risk swimming with the fishes.
It's Knapford Station's birthday and all the engines are preparing for the festivities. When a photographer comes to photograph the engines for a billboard Diesel accidentally obscures Thomas; Thomas thinks this was on purpose and is so distracted he goes the wrong way and knocks the billboard over. This gives an opportunity for all the engines to be in a new photo, but when Diesel isn't told, he has to do all the others' jobs. Everything is soon rectified and the new photo is put up at Knapford.
Bitzer thinks the future has arrived when he takes delivery of his new high tech farmyard control module but when the gadget malfunctions, Bitzer is left wishing for his old whistle.
It's the Percival twin's birthday, and Duncan is to give them a special birthday ride, just as he always does. Duncan is getting his special birthday flag fitted, just as the Thin Controller, Mr. Percival, arrives with news. He asks Duncan to collect a hot air balloon from the Transfer Yards. The twins will be getting a ride in a hot air balloon for their birthday.
Thomas is worried about his brakes as they make funny noises. While ordered to deliver bricks for the repairing of the Sodor River Bridge, Thomas goes on a bumpy tracks which makes the bricks fall out of his trucks, Thomas doesn't know this, then while trying to brake on Gordon's hill, hits some emergency buffers, as more bricks fall off. Thomas finally makes his way to the bridge, but his brakes stop working all together and finds himself dangling on top of the gap of the bridge. With the help of Stanley, Rocky and Murdoch, they recover the bricks and Thomas has his brakes fixed at the yards. He comes back to the River Bridge to thank Stanley for his help.
Thomas is given the job of transporting a crate containing a very special statue called The Lion of Sodor. However, he thinks his cargo is a real lion, so he decides to take extra care of it. Throughout his journey to Knapford, Thomas decides to make sure that the lion is well fed and comfortable, so he collects syrup from Henry, fish from Edward, and straw from Toby, which are all placed inside the crate. When Thomas arrives at Knapford station, the crate is opened up and everyone is shocked to see the Lion of Sodor in a terrible mess. Thomas feels very silly and owns up to what he thought of his cargo. The Fat Controller and Henry explain that the Lion of Sodor was a special statue which got broken. Thomas' cargo was the new statue of the Lion. Feeling silly, Thomas agrees to get the statue clean. Taking advice from Henry and Edward, Thomas gets it cleaned at the wash-down and then polished at the Sodor Steamworks. Once the Lion of Sodor looks very clean, Thomas takes Toby's advice to a short-cut via the windmill to get back to Knapford station, where the Mayor of Sodor is very pleased to see the new statue.
Bubba fixes Wasabi's TV satellite and is accidentally struck by some sort of powerful force. This force causes Bubba to become super smart and he uses his smarts to put the Wasabi World citizens in a zoo. It's up to the Chooks to find a way to stop Bubba's new evil plans.