Keiynan Lonsdale is an Australian actor, dancer, and singer-songwriter. He is known for roles such as Oliver Lloyd in the ABC series Dance Academy (2012–2013), Wally West/Kid Flash in the CW series The Flash (2015–2023) and Legends of Tomorrow (2017–2018), and Abraham "Bram" Greenfeld in the film Love, Simon (2018). His other films include The Divergent Series: Insurgent (2015) and The Finest Hours (2016). Lonsdale has also worked as an MTV VJ and released original music recordings, including a studio album in 2020.

Kid Flash is the name of several fictional superheroes appearing in comic books published by DC Comics, originally created by John Broome and Carmine Infantino, as a junior counterpart to DC Comics superhero The Flash. The first version of the character, Wally West, debuted in The Flash #110 (1959). The character, along with others like the first Wonder Girl, Aqualad, and Speedy, was created in response to the success of Batman's young sidekick Robin. These young heroes would later be spun off into their own superhero team, the Teen Titans. As Kid Flash, Wally West made regular appearances in Flash related comic books and other DC Comics publications from 1959 through the mid-1980s until the character was reinvented as the new version of The Flash.