Every family has that one cousin who is supposed to follow the golden child's act and never quite gets the same ovation.
On Polymarket, traders have already decided who plays that role this summer.
Supergirl, Warner Bros. and DC Studios' follow-up to last year's Superman, opens in theaters Friday, June 26. Milly Alcock plays Kara Zor-El, Jason Momoa joins as Lobo, and David Corenswet reprises his role as Superman in a cameo. Craig Gillespie (Cruella; I, Tonya) directs, trading Superman's earnest tone for a grittier, road-trip story about grief and vengeance across the cosmos.
Why Polymarket Traders Are Leaning So Hard Toward a Soft Opening
On the Supergirl Opening Weekend Box Office market, the under-$52 million domestic bracket holds a 92% probability, with every higher range trailing far behind.
That $52 million line isn't picked at random. It sits close to where 2023's The Flash opened domestically ($55 million) and just north of The Marvels ($46 million), two of the last decade's most cited superhero disappointments. A movie tracking near or under that mark it's keeping company with the genre's cautionary tales.
How Superman's $125 Million Debut Set an Almost Impossible Bar
Here's where the family comparison stings.
Superman opened to $125 million domestically last July and closed its run with $354.2 million at home and $618.7 million worldwide, making it the making it the tenth-highest-grossing release of 2025.
Yet, the shadow of the past looms large.
While last year’s relaunch beat 2013’s Man of Steel in its opening weekend, it still finished its global run nearly $50 million short of Henry Cavill’s debut. For Warner Bros., the new DC Universe it was built to scale. And that adds immediate, immense pressure to the family's next in line.
A sub-$52 million opening for Supergirl would land at less than half of what her cousin pulled in over his first three days. And the tracking has only moved in one direction since early June. Deadline's first projection, published June 4, put the film at $55 million-plus. By June 22, even Deadline had quietly revised that down to a $50-55 million range, folded into a story about the marketing campaign rather than given its own headline.
Other trackers slid further: Box Office Pro settled at $45-55 million, and BoxOfficeTheory flagged a possible $39 million floor.
A $100 Million Promo Blitz That Still Hasn't Moved the Needle
What makes the downward trend particularly striking is the massive corporate machinery failing to stop the bleed. Warner Bros. and DC Studios secured over 80 promotional brand partners. From Krypto-themed chicken buckets to dedicated retail space, the movie's presence is practically inescapable.
Yet, the tracking slipped anyway. This highlights a crucial insight for the market: consumer awareness is no longer the bottleneck. Audiences may know Supergirl is coming; they just haven't decided if they need to see her on day one, especially with Pixar’s Toy Story 5 projected to maintain a strong grip on family audiences during its second weekend.
The Thin Line Between a Panic and a Payout
This is exactly where the narrative transforms from a slow slide into a high-stakes weekend standoff. The under-$52 million bracket sits at a commanding 92% probability, but a look at the actual industry numbers reveals just how razor-thin that margin really is.
Deadline’s freshly revised projection of $50M–$55M straddles the market’s defining line perfectly. While pessimistic trackers flag a floor closer to $40 million and early social media reactions have been mixed, if the official review embargo lifts on Wednesday to widespread critical acclaim, a late surge in walk-up ticket sales on Friday could easily push the opening weekend toward $53 million or $54 million.
Kara Zor-El might be an underdog compared to her cousin, but she is positioned perfectly to trigger a massive shakeup the moment the first box office receipts start rolling in.
