Board Thread:The Flash discussions/@comment-24152851-20190130031943/@comment-26618197-20190206142648

Besides Thawne it's typically the result of what happened during the last episode of the previous season. Kind of a way to tease someone without showing anything like Supergirl does. Lately they've hinted at the new villain through characters from the future and press releases. Truthfully they don't do anything special they just connect event A with event B no matter how sloppy it may seem.