With Superman and Lois’ last season acting as the last remnant of the Arrowverse, it’s a great time to reflect on another DC hero in that universe and the villains who have already wreaked havoc on Barry Allen’s life in The Flash. Whether they have a personal connection to the Scarlet Speedster or are simply far more dangerous than most, these antagonists have proven to be memorable for a number of reasons. The Flash was impressive from the start, including some of Barry Allen’s most iconic villains right from the start, and setting the stage for what was to come.…