The fight against Zoom is only going to get tougher, according to a new trailer for The Flash.

Barry Allen (Grant Gustin) is currently locked in Zoom's Earth-2 dungeon with the portal to Earth-1 still kaput. But the new "Zoom's Coming" extended trailer shows that he still has a lot to learn before he's ready to take on his toughest opponent yet.

Barry will eventually get out of the prison, but his toughest tasks may still be ahead — including more battles with Killer Frost (Danielle Panabaker) and some Earth-2 complications stemming from the fact that he's married to Iris (Candice Patton) in the "alternate" universe. In addition, he gets a visit from Arrow's Diggle (David Ramsey) and Lyla (Audrey Marie Anderson), which means things can only have gotten worse on Earth-1.

The Flash's Danielle Panabaker teases the introduction of Killer Frost and Velocity 9

The teaser also offers a quick peak at King Shark's highly anticipated return. Even if it's bad news for Barry, it's a good time for fans.

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