Thomas & Friends: Big World! Big Adventures!

Merlin, a stealth engine, makes his inaugural journey from the mainland to the island of Sodor, arriving for the first time on the railway. Percy is intent on spotting the so‑called ‘invisible’ locomotive, determined to catch a glimpse of Merlin despite its stealthy reputation.

“Seeing is Believing” is a programme presented as an episode in the broader series. It falls under the genre of an episode‑type show, and its title hints at the central premise that will be explored within the short narrative. The format is straightforward, focusing on a single, self‑contained story rather than an extended serial. The core of the episode centres on the arrival of Merlin, a stealth engine that makes its debut on the island of Sodor after travelling in from the mainland. Merlin’s unique, almost “invisible” nature catches the attention of Percy, who becomes determined to get a look at this mysterious locomotive. Percy’s curiosity drives the action, prompting him to seek out the elusive engine as soon as it appears. Percy’s resolve is highlighted throughout the segment; he is intent on confirming the existence of the engine that many describe as unseen. His pursuit underscores the episode’s title, as the storyline revolves around proving that what is claimed to be invisible can indeed be observed. The episode marks Merlin’s first visit to Sodor, making the encounter a notable event for the island’s residents. This inaugural appearance sets the stage for the brief but focused plot, where the interaction between Percy’s eagerness and Merlin’s stealthy presence forms the entirety of the narrative.