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The final moments of season four of The Flash saw Barry Allen (played by Grant Gustin) being saved by his daughter, Nora Allen (Jessica Parker Kennedy). The mysterious speedster later appeared at Barry’s house to break the news that she was his daughter from the future - and she was trapped in his timeline. Season five will surely see Team Flash taking on the new challenge of trying to get Nora out of their timeline. And this is on top of battling the new super villain of the show: Cicada (Chris Klein).

However fans of the source material may be familiar with the shortcomings of having multiple speedsters in one universe. In the comic books it is explained that for each speedster that occupies each world, a smaller amount of speedforce power is available. This crucial point has left Barry in a bad way a number of times over the years, as he has found his speed depleting when more speedsters arrived on scene. Although it has not yet been established so far in The Flash, this information could lead to the saving of Nora Allen. While Reverse Flash (Tom Cavanagh) wasn’t a true speedster, he leeched speed from the tachyons in Earth One. But Barry was arguably at his weakest when facing Savitar alongside Wally West (Keiynan Lonsdale) and Jesse Quick (Violett Beane) - and could be explained by the degradation of his powers with more superheroes at his side.

The Flash season 5: Barry Allen may be given a horrible decision

With Nora now inexplicably trapped on Earth One, could she be struggling to run back to her own timeline due to a lack of power now that she is alongside her father at the peak of his power? The upcoming season will see Barry taking on Cicada, who is notorious for creating the Cicada Cult. This cult is determined to kill anyone who has been saved by The Flash during his reign - but with many of Team Flash being saved by Barry in recent years, they may all be at risk. But will this stop Barry from looking to save his daughter first and foremost? If Nora truly is trapped on Earth One because of Barry’s powers, could he somehow be looking at a harrowing decision between killing his future daughter, or giving up his speedster powers?

The Flash season 5: Wally West may have used up some of the speed force

The Flash season 5: Wells may see Barry with a horrible task ahead of him