Supergirl Is Now Streaming on HBO Max — Milly Alcock's Kara Zor-El Gets a Second Chance After a Rough Box Office Run

Missed Supergirl in Theaters? Milly Alcock's Kara Zor-El Just Landed on HBO Max

Supergirl is officially streaming on HBO Max as of Thursday, September 10, 2026 — giving DC fans a second chance to catch Milly Alcock's debut as Kara Zor-El after a theatrical run that crashed harder than a Kryptonian pod landing. If you skipped it in cinemas back in June, now is the perfect time to judge it for yourself from the couch.

Directed by Craig Gillespie (I, Tonya, Cruella) and adapted from Tom King's acclaimed Supergirl: Woman of Tomorrow comic, the film is the second chapter in James Gunn and Peter Safran's rebooted DC Universe — following last year's Superman starring David Corenswet, who also cameos here alongside Jason Momoa.

What Is Supergirl About, and Who Stars in It?

The story follows Kara Zor-El as she teams up with an unlikely young companion, played by newcomer Eve Ridley, on an interstellar journey of vengeance and justice across the cosmos — until an unexpected adversary strikes way too close to home. Think cosmic road-trip revenge tale, not your typical Metropolis origin story.

The ensemble cast is stacked: Matthias Schoenaerts plays the villainous Krem of the Yellow Hills, with Emily Beecham and David Krumholtz in key supporting roles. Plus, an American Sign Language (ASL) version performed by Catalene Sacchetti is also streaming exclusively on HBO Max starting the same day — a genuinely cool accessibility win for DC Studios.

Box Office Flop or Streaming Sleeper Hit?

Let's be honest: Supergirl bombed in theaters. Released on June 26, 2026 in 3,600 theaters across the US and Canada, it was projected to open between $40-55 million — but ended its entire global run with just around $126 million worldwide against an estimated $170-186 million budget. That makes it the lowest-grossing DC theatrical release ever, with a reported loss near $250 million.

Critically, it sits at 53% on Rotten Tomatoes (Tomatometer) with a much kinder 72% Popcornmeter audience score. The critics consensus praises Alcock's swagger — "a promising new hero in the DCU who's still waiting for an adventure that matches her vigor" — while calling the story familiar. Sound familiar? Madame Web, The Marvels, and Blue Beetle all found bigger second lives on streaming after soft box office runs.

• Streaming now: HBO Max (Basic ad tier from $9.99/month)
• Theatrical release: June 26, 2026 (Warner Bros. / DC Studios)
• Runtime & vibe: cosmic revenge adventure, rated PG-13
• What's next in the DCU: Clayface hits theaters October 23, 2026, then Man of Tomorrow on July 9, 2027

Bottom line: Supergirl matters to the DCU's future whether it flopped or not — Kara Zor-El is integral to Gunn's roadmap. So if you care about where Superman, Clayface, and Man of Tomorrow are heading, this HBO Max drop is basically required homework. Grab popcorn, lower expectations slightly, and let Milly Alcock surprise you.