The Great Discovery

The Great Discovery is a sixty minute special.

Characters

 * Thomas
 * Edward
 * Henry
 * Gordon
 * James
 * Percy
 * Toby
 * Harvey
 * Emily
 * Arthur
 * Stanley
 * Duncan
 * Jack
 * Alfie
 * Madge
 * Harold
 * Cranky
 * Skarloey
 * Rheneas
 * Sir Handel
 * Freddie
 * Mighty Mac
 * Sir Topham Hatt
 * Lady Hatt
 * Miss Jenny
 * Mr. Percival
 * Bill and Ben (do not speak)
 * Molly (does not speak)
 * Mavis (does not speak)
 * Salty (does not speak)
 * Annie and Clarabel (do not speak)
 * Rocky (does not speak)
 * Terence (does not speak)
 * Bertie (does not speak)
 * Trevor (does not speak)
 * Max and Monty (do not speak)
 * Oliver (does not speak)
 * Ned (does not speak)
 * Jeremy (does not speak)
 * The Mayor of Sodor (does not speak)
 * Rosie (cameo)
 * Whiff (cameo)
 * Diesel (cameo)
 * 'Arry and Bert (cameo)
 * Diesel 10 (cameo)
 * Dennis (cameo)
 * Peter Sam (cameo)
 * Rusty (cameo)
 * George (cameo)
 * Butch (cameo)
 * Elizabeth (cameo)
 * Buster (cameo)
 * Stephen Hatt (cameo)
 * Bridget Hatt (cameo)
 * Jem Cole (cameo)
 * The Refreshment Lady (cameo)
 * Cyril the Fogman (cameo)
 * Lord Callan (cameo)
 * Sodor Brass Band (cameo)
 * The Storyteller (cameo)
 * Kuffy the Clown (cameo)
 * Henrietta (music video cameo)
 * Kelly (music video cameo)

Locations

 * Great Waterton
 * Kellaby
 * The Wharf
 * Brendam Docks
 * Sodor Shipping Company
 * Transfer Yards
 * Rolling River Bridge
 * Village Square
 * Knapford Yards
 * Sodor Airport
 * The Windmill
 * Gordon's Hill
 * Knapford
 * Wellsworth
 * Maithwaite
 * Centre Island Quarry
 * Dingley Hall
 * Great Waterton Sheds
 * Tidmouth Sheds
 * Kirk Ronan Junction
 * Morgan's Mine
 * The Depot
 * Henry's Tunnel
 * Stepney's Branch Line

Trivia

 * The first and only special to date where Diesel 10 appears, but does not speak.
 * This special marks Harvey, Arthur and Alfie's last speaking roles to date, The last time Bill and Ben are seen together to date, The last time Max and Monty are seen together to date as well the last appearances of Bill, Molly, Elizabeth, Terence, Madge, Diesel 10, George, Butch, Dennis, Oliver, Ned, Kelly, and Buster to date.