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Total Film
Total Film
Entertainment
Fay Watson

Superman star David Corenswet improvised a lot of his lines in Supergirl as he "was in such control of his character"

Milly Alcock as Supergirl and David Corenswet as Superman in Supergirl (2026).

Supergirl may be first and foremost Kara Zor-El's introduction to the DCU, but her cousin Superman makes a few appearances too. The latest superhero movie, and the second in the new revamped franchise, stars Milly Alcock as Supergirl, who reluctantly teams up with a young girl on a mission of revenge when her dog Krypto is poisoned.

However, as well as focusing on their mission, the movie also dives deeper into Supergirl's backstory – and how she first met her cousin, Kal-El on Earth. David Corenswet reprises his role as Clark Kent in the film and, according to director Craig Gillespie, he improvised a lot of his dialogue.

"The wonderful thing with David, it was more that when he came in, he was so aware of his character," Gillespie tells GamesRadar+ of the Superman scenes. "You know, in that opening scene with him, where he meets Milly, was the first day of the shoot. It was the first day I was working with him, and it was wild to see him in his superhero outfit turn up, and he immediately started improvising."

He added that he improvised some of the funniest lines in the exchange, including some quips about Kara's bag and whether she was into bowling. "That was all improvised, and Milly's speaking in a different language, and then I threw out to Milly, 'Why don't you ask him why he's in his underwear?'," he laughs.

"They immediately got into this banter that was wonderful, and you could feel their dynamic out of the gate," Gillespie adds of their relationship in the movie. "It was just happening on the set in a way, it's like I think David was in such control of his character, so it was beautiful."

Supergirl is out in UK cinemas on June 25 and arrives in US theaters on June 26. For more, check out our breakdown of how to watch the DC movies in order and all the upcoming DC movies and shows you need to know about.

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