Update: This is episode 2×12 Race Track: Barry and Wells team up to figure out a way to close the breaches but their plan has stalled because of a new meta human named Tar-Pit. Iris is concerned for Wally’s safety after she finds out he is involved in drag racing. After he refuses to stop she makes a move that puts her in danger.
So that’s the meta-human who was at Vancouver City Hall a few weeks ago. The Flash cast Marco Grazzini (Heroes Reborn, The Magicians) as molten asphalt meta-human Tar Pit for a Spring episode, according to ComicBook.com.
This is the Tar Pit motion capture suit at Vancouver City Hall as Central City Police on Monday, November 23rd.
Screen cap of episode.