Thread:Shrekyardigans/@comment-25498563-20161225121534/@comment-25498563-20170204160924

It's called "Thomas Loses His Memory".

Summary: "After getting hit on the head with a boulder thrown out of one of Ben's trucks, Thomas gets amnesia and loses his memory. He doesn't even remember being Sodor's number one tank engine. So, the other engines try help him remember things. But Thomas regains his memory after getting hit in the head again by a piece of scrap dropped on him by Reg."