For the first time in 'The Flash' history , the team will be facing not one, but two "bad guys ; Dr. Alchemy and Savitar. 

According to Todd Helbing, executive producer of the 'The Flash Season 3'  in his interview with TVLine, he said: " Just when I think I've taken down this guy, I've got this [Other] dude to worry about, and vice versa.' It's like flanking." Though Helbing said at the San Diego Comic-Con Via Variety, that Savitar will be introduced at the later part of the season, he also confirmed on his interview with TVLine that there are chances that Team Flash will deal with more than one villain at the same time as Dr. Alchemy and Savitar will Coexist in the Season 3 of the Flash. 

Todd Helbing said: " [We're] trying to have powers that they both possess play off of each other, It's not just, 'Oh, I have to catch this guy and take him down.' It's like, ' Crap, now there's this other guy, Dr. Alchemy', who has these transmutation qualities [via] this Philosopher's Stone. You can start to learn what he does with this stuff and how they both of them are coexisting.' 

On the other hand, Comic Book Reported that Violett Beane will surely be part of The Flash Season 3, however, it is still unsure whether she will be Jesse Quick or not.According to a Tweeter post made by Canadagraph, the self-proclaimed " autograph hound' claims to had an autograph signed by Beane on Vancouver while filming the The Flash Season 3, According also to that same Tweet that She [Violett Beane]  signed the autograph while wearing the Jesse Quick costume. 

'The Flash Season 3' premieres this October 4, Tuesday at 8p.m on The CW