The Arrowverse's Barry Allen may have survived "Crisis on Infinite Earths" but there are still plenty of threats to Central City when The Flash.

In a promo for Season 6's midseason premiere, titled "Marathon," Barry and Iris West-Allen celebrate the Arrowverse heroes saving the day, only to discover their world has changed considerably.

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A new terrorist organization has arisen in Central City, while Cisco Ramon notes that the destruction of the Arrowverse has visibly altered the natural laws of physics. Even Iris appears affected by the recent changes, hinting at a darker turn for Barry's wife as the Scarlet Speedster races into the brave new world.

Going into its midseason finale, The Flash has remained the most-watched scripted series on The CW, and the network recently renewed the hit Arrowverse series for a seventh season.

In the meantime, Barry may have gained a new lease on life, but things don't appear to be getting any easier for Team Flash.

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Airing Tuesdays at 8 p.m. on The CW, The Flash stars Grant Gustin, Candice Patton, Carlos Valdes, Danielle Panabaker, Tom Cavanagh, Jesse L. Martin, Danielle Nicolet and Hartley Sawyer. The series returns Tuesday, Feb. 4.