Splatter is a diesel who worked for the Oiler Committee
Along with his twin Dodge, he and the other diesels were successful in taking over the Sodor Steamworks, and the scrapping of Gordon and Edward. But after Rudolph Diesel was arrested, he and the other diesels were ordered to clear the mess they had created on Sodor by Phil Aardman. Once the diesels completed their task, he and the other non-compliant diesels were sent back to the mainland. Where he is now is unknown.
The model of Splatter used was the original 2000 Learning Curve Thomas Wooden Railway model from the twin pack with Dodge, from the Thomas and the Magic Railroad Movie, when it first came out.