The New Series is a term used to refer to the seasons of Thomas and Friends produced by HiT Entertainment between 2004 and 2008. Season 8 introduced many new changes to the series: the new title sequence featured a new theme tune based on the song Engine Rollcall; the series featured newer models with different paintwork, new facial expressions and more dynamic camera work; the episodes became longer, being seven and a half minutes long; and the series, when aired on television, was often split into thirty-minute blocks with three episodes, educational puzzles and songs and "Engine Rollcall" played at the end.
The new series was a big change from the classic series and often included recycled plots, such as Henry again requiring "special coal", and the engines appearing to possess the ability to move without a crew. The series also introduced more female characters, which the classic series was criticised for the lack thereof.
- The Halloween Engine (does not speak)
- The first season to be produced by HiT Entertainment and the first produced by Simon Spencer.
- The first season to not introduce any non-human characters, excluding the Halloween Engine.
- The first season to use the new opening titles and theme.
- The first season to have Sam Barlow as story executive.
Calling All Engines! is the first Thomas and Friends special. It was released in 2005 in the United Kingdom and United States. It was narrated by Michael Angelis in the UK and Michael Brandon in the US.
- The first appearance of Daisy since the fourth season, the first appearance of Diesel 10 outside of Thomas and the Magic Railroad and the first and only appeance of Lady outside of the aforementioned movie.
- The only special to feature learning segments.
- The first appearance of the rebuilt Tidmouth Sheds.
The ninth season of the television series aired in the United Kingdom and the United States in 2005. It was narrated by Michael Angelis in the UK and by Michael Brandon in the US.
- Molly - a shy yellow tender engine
- Neville - a black tender engine
- Dennis - a lazy Diesel
- Mighty Mac - a Double Fairlie
- Mr. Percival - the controller of the Skarloey Railway
- Proteus (does not speak) - a legendary narrow gauge engine
- This was the first season to have Sharon Miller as script editor.
- The first season to have Thomas appear in every episode, however he did not speak in all of them.
The ninth season of the television series aired in the United Kingdom and the United States in 2006. It was narrated by Michael Angelis in the UK and by Michael Brandon in the US.
- Rosie - a pink tank engine
- Freddie - an old narrow gauge Warhorse engine
- Rocky - a red recovery crane
- Jeremy - a jet plane
- The Admiral
- Alice (does not speak) - a little girl who lives on High Farm
- "Dusty" Dave - a miller who runs a flour mill
- The only season to have twenty-eight episodes, making it the longest in the show's history.
- The only season not to air in Australia. Instead, it was released directly to DVD.
- Sir Handel makes his first appearance since the fourth season, and Duck makes his first appearance since the seventh season, albeit in special footage in a music video..
The eleventh season of the television series aired in the United Kingdom and the United States in 2007. It was narrated by Michael Angelis in the UK and by Michael Brandon in the US.
- Whiff - a rubbish-collecting tank engine
- Billy - a bubbly orange tank engine
- Hector - a large coal hopper
- Madge - a snub-nosed lorry
The Great Discovery is a direct-to-DVD special. It was released in fall 2008 in the UK and the US.
- Stanley - a silver tank engine
- The final production to use models exclusively.
- The first and only production to be narrated by Pierce Brosnan.
- The first appearance of The Pack since Jack and the Sodor Construction Company and Terence makes his first appearance since the seventh season.
As part of a transitional period, the twelfth season would see computer-animated faces and characters superimposed over the live-action environment of earlier seasons. Characters could now display a variety of new expressions and their mouths would move in sync with the storyteller's voice when they are talking, whilst their thinking is evident when their mouths aren't moving in sync! People, animals, and certain other characters became wholly CGI elements.
This change was made possible by motion-capture animation. When a character's face needed to move, the moulded faces of earlier seasons would be replaced by a target, to which the computer could attach a face in post-production. The animation for this and future seasons would be provided by Nitrogen Studios, based in Canada.
- Hank - an American tender engine
- Flora - a yellow tram engine
- Colin - a green crane who works at The Wharf.
- The first season to have only twenty episodes.
- The first season to use CGI elements.
- The last season to use models and clay faces.
- The last season to have the characters voiced by the narrator.