The Flash season one already ended and won't come back until October, but in the mean time, questions will rise, such as who will be the season 2 big bad. There are some obvious choices like Gorilla Grodd and Killer Frost, but there are a few that might seem a tad odd or strange. Alright, time to get started on this list.
1: The Rogues
The Rogues are a group of The Flash villains who seek revenge against the Scarlet Speedster. The most famous members of the Rogues are their leader, Captain Cold, Heatwave, Pied Piper, Golden Glider, the Trickster, Mirror Master, Weather Wizard, the Top, and Abra Kadabra. They might be the season 2 big bad because the Flash series has already introduced most of the Rogues, such as Captain Cold, Heatwave, Golden Glider, the Trickster, Pied Piper, and Weather Wizard. However, Captain Cold and Heatwave are going to be main characters on Legends of Tomorrow, which runs at the same time as the Flash. I doubt the Rogues will be the big bads, but everybody is an option.
2: Killer Frost
I know Caitlin is still part of team Flash, but, what if it's not that Caitlin? Maybe the singularity dumps other universes into ours, such as, gosh, I don't know, maybe evil Caitlin. What if she is the one to oppose team Flash, so we'll have Killer Frost AND our sweet old Caitlin, I think that's a great comprimse for all fans. We will see Killer Frost in the near future, as the Speed Force showed us. If it is our Caitlin however, what makes her turn on team Flash, well, I don't even have a clue.
3: Gorilla Grodd
Gorilla Grodd was the villain for episode 21 of the Flash "Grodd Lives", and he didn't win or lose against the Flash, but got hit by a train. He was shown at the end of the episode doing a King Kong style climbing up and jumping off a building, indicating he'll come back, which I think we all knew. The only thing about Grodd being the big bad is that he would have to appear A LOT if he's the big bad, but the graphics for him cost a lot of $$$$. That's why I believe Grodd will be like Count Vertigo on Arrow, not a big bad, but a re-occurring villain who you start to recognize.
4: Cobalt Blue
I know the chances of seeing Cobalt Blue are slim, but if Damian Dark is going to be the big bad for season 4 of Arrow, wouldn't Cobalt Blue kinda fit in? Plus I always thought that's what Eddie would always become, and who knows what the singularity did to his body, what if it turned him into a meta?
5: Mirror Master
I know he's a rogue, but Mirror Master would be a GREAT big bad. He hasn't been introduced, which means you can do whatever with him, he can be like Killer Frost (maybe) and come through the singularity, or maybe he'll be a late blooming meta from the Particel Accelerator, or maybe he will build or steal a mirror gun. I personally vote for Mirror Master.
Well there are my selections for season 2 big bads for the Flash. Comment if you have anyone I missed or any ideas of your own.