Sleeping Beauty is the fourth episode of the 4th Season.
After a hard day's work, the engines return to the shed and ask Thomas to continue the story of Duke. While Duke was in his shed for many years, he was certainly not forgotten and recently a team of people visited Sir Topham Hatt intending to find and rescue Duke. The team was prepared with maps and knew where to look, so Sir Topham Hatt agreed. Everyone set off to the mountains in a train and began the long search. As the days passed, the search grew harder and there was no sign of Duke, but the rescuers were just as determined to find him. Finally, the search ended, quite by accident, when one of the team fell through the roof of Duke's shed, having not realised he was standing on it. Duke wakes up and asks the men if they are vandals, but they assure him that they are there to rescue him and reunite him with Falcon and Stuart. After digging him out of the shed, they took Duke to his new home, the Skarloey Railway. Falcon and Stuart - now Sir Handel and Peter Sam - were ready to greet their old friend, who complained that they woke him up and started to tell them about the older days. The two engines laughed at this and told Duke that they were all due to go back to work tomorrow and they could keep Duke in order. Duke pretended to be cross, but he could not be happier to be back at work with his friends.