WARNING: This article contains spoilers for the upcoming fourth season of The Flash.

Filming of the fourth season began just last week, and already photos have surfaced from The Flash that signal significant changes for the CW drama.

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The photos, which are circulating on Twitter, reveal Wally West actor Keiynan Lonsdale wearing the red costume that Grant Gustin's Barry Allen has sported since Season 2.

While Gustin's return as The Flash is all but inevitable, there's certainly precedence for Wally West assuming the mantle. After the apparent death of Barry Allen during DC Comics' Crisis on Infinite Earths, Wally took his mentor's place, becoming what many readers consider to be the definitive version of The Flash for nearly 25 years. With The CW's iteration of Barry Allen trapped in the Speed Force, it makes perfect sense for Kid Flash to take on his mentor's responsibilities, at least for time being.

RELATED: The Flash Season 4 Premiere Title Revealed As Filming Begins

Returning Tuesday, Oct. 10, at 8 p.m. ET/PT on The CW, The Flash stars stars Grant Gustin, Candice Patton, Danielle Panabaker, Carlos Valdes, Tom Cavanagh, Jesse L. Martin and Keiynan Lonsdale.

(via Screen Rant)