Superman Trailer Fuels Speculation on Possible Supergirl Appearance

Overview

Milly Alcock is rumored to appear as Supergirl in the forthcoming Superman film, sparking excitement among fans.
Fans believe they have spotted Supergirl’s image reflected in Kelex the robot during the Superman trailer.
Alcock’s potential cameo could be influenced by the established familial connection between Superman and Supergirl.

Excitement is building around the possibility of Milly Alcock debuting as Supergirl in the anticipated Superman movie. Fans are convinced they caught a glimpse of her character in the recently released trailer.

In January 2024, it was announced that Alcock, famous for her role as young Princess Rhaenyra Targaryen in House of the Dragon, will headline the upcoming film Supergirl: Woman of Tomorrow. While there has been no official confirmation of her involvement in David Corenswet’s Superman, set to premiere on July 11, 2025, the trailer has fueled speculation among fans about her potential appearance.

Fans Connect Milly Alcock’s Supergirl with Superman Trailer

Two weeks ago, Warner Bros. and DC unveiled the first official trailer for Superman. In one poignant moment, Superman is seen grieving beside a metallic figure—Kelex, a Kryptonian service robot known for its role as custodian of the Fortress of Solitude and a helper of the House of El before the destruction of Krypton. Fans were quick to note a reflection of a female figure appearing in Kelex’s metallic surface, leading to speculation that it might be Supergirl. A post on social media by DCU Brief questioned, “Could this be Supergirl in the Superman trailer?”and sparked lively debate.

Could this be Supergirl in the Superman trailer? pic.twitter.com/BPzdNXd2bw — DCU Brief (@DCUBrief) December 31, 2024

The reactions were mixed; while some fans expressed belief in seeing Supergirl, others were skeptical, claiming the reflection was instead a robot or possibly even Krypto, Superman’s canine companion, whose appearance in the film has already been confirmed. Given that the trailer shows Superman struggling in the snow and calling for help, the theory linking the reflection to Krypto is understandable. One eager fan even tagged James Gunn, director and co-CEO of DC Studios, in hopes of clarification, asking in a comment, “@JamesGunn is this Supergirl? Can you confirm?”

Considering the likelihood of Alcock appearing as Supergirl in Superman, it’s common practice for superheroes to make brief appearances in other films before their own dedicated storylines. For instance, Gal Gadot first appeared as Wonder Woman in Batman v Superman: Dawn of Justice (2016), prior to her standalone feature. Similarly, Tom Holland was introduced as Spider-Man in Captain America: Civil War (2016) before starring in his solo project, Spider-Man: Homecoming (2017). A similar path could be in store for Alcock, particularly with Supergirl: Woman of Tomorrow scheduled for release a year after Superman.

Moreover, Alcock’s casting was announced shortly before Superman entered the wrapping stages of production, which could hint at her inclusion in the film. Featuring Alcock as Supergirl not only aligns with the characters’ familial ties as cousins but also enriches the narrative depth as Gunn explores Superman’s relationships with key characters. The introduction of Supergirl within the Superman storyline could forge a significant bridge leading into Supergirl: Woman of Tomorrow.

Mark your calendars: Superman is set to reach theaters on July 11, 2025, while Supergirl: Woman of Tomorrow will premiere on June 26, 2026.

Source: DCU Brief/X

Source & Images