Superman (2025) launched James Gunn's DCU eleven months ago to substantial commercial and critical success. Supergirl releases June 26, 2026 — the DCU's second major theatrical bet. Both films feature Kryptonian leads, but the comparison reveals how differently Gunn's DCU treats its sibling Kryptonians.
Director split. Superman is directed by James Gunn — DC Studios co-CEO and the franchise's primary creative architect. Supergirl is directed by Craig Gillespie (I, Tonya, Cruella) — a substantial choice for the DCU's quieter, character-driven Kara Zor-El story. Gunn co-wrote the Superman screenplay; Gillespie's Supergirl is based on Ana Nogueira's screenplay adapting Tom King's 2022 comic Supergirl: Woman of Tomorrow. The directorial split is intentional — Gunn doesn't want every DCU film carrying his signature; Supergirl is the first proof that the DCU can succeed with non-Gunn directors.
Tonal opposition. Superman is a hopeful, sun-drenched film about institutional accountability — Clark Kent answering to journalists and the world rather than acting unilaterally. Supergirl is, per pre-release reviews, a road-trip drama with substantial silence, grief, and quiet character development. Critics from the embargo lift have praised Milly Alcock's "punk-rock" Kara as the most emotionally honest superhero performance since Christopher Reeve. The two films deliberately don't share tone — one is bright, one is melancholic — but they share the substantial moral commitment Gunn has built into the DCU's foundation.
Lead casting contrast. David Corenswet's Superman is a confident, deliberately old-fashioned Clark Kent — the actor was picked specifically for his ability to play earnestness without irony. Milly Alcock's Kara Zor-El is younger, angrier, and more visibly traumatized — Alcock's House of the Dragon (2022) background informs her ability to play quiet rage. The casting contrast mirrors the comic-book lineage: Superman is the established icon, Kara is the orphan-survivor with substantial unprocessed grief over Krypton's destruction. Both casts work because they don't try to mirror each other.
Source-material fidelity. Superman draws on Grant Morrison's All-Star Superman (2005-2008) and Mark Waid's Superman: Birthright (2003-2004). Supergirl is much more directly adaptive — Tom King's Woman of Tomorrow is recreated on screen with substantial fidelity to King's specific narrative choices, including Eve Ridley's Ruthye as the framing-perspective character. Gunn has said Supergirl is the DCU's most-faithful comic-book adaptation since the franchise launched; Superman, by contrast, synthesizes multiple comic-book influences into Gunn's original screenplay.
Box-office trajectories. Superman opened at $145M domestic ($720M worldwide) in July 2025 — the strongest DCU launch. Supergirl pre-sales tracking from NRG projects $85-110M opening on June 26, which is substantial but below Superman's launch (consistent with Supergirl being a smaller-scale character drama rather than a tentpole superhero film). The June release window is also smaller than Superman's July window. Both films are expected to be profitable; neither needs Superman-tier numbers to validate the DCU strategy.
Connecting tissue. Both films share substantial DCU continuity. Superman's plot involving Lex Luthor's "Pocket Universe" black-site directly bridges to events referenced in Supergirl. Supergirl is set after Superman (post-Boravia crisis); Corenswet's Superman makes a confirmed brief appearance in Supergirl (per the trailer). Krypton's destruction is depicted differently in each film — Superman uses the Jor-El "rule them and grow strong" message; Supergirl shows the actual destruction sequence from Kara's perspective. The continuity is substantial but not overwhelming.
What each film proves. Superman proved Gunn's DCU could re-launch DC theatrical content profitably after the substantial DCEU collapse. Supergirl needs to prove the DCU can succeed without Gunn directing — that the franchise can sustain quality across multiple directors. If Supergirl hits its commercial and critical targets (which the 88% RT review-embargo lift suggests is likely), the DCU's continued slate (Lanterns, The Batman Part II, Brave and the Bold) becomes substantially more credible.
What it means for the DCU. If both films succeed (the most likely scenario), Gunn's DCU is on a substantially stronger trajectory than the DCEU ever achieved. The DCEU's first two films (Man of Steel + Batman v Superman) underperformed and led to the franchise's eventual abandonment; Gunn's first two films (Superman + Supergirl) are tracking substantially better both critically and commercially. The next major DCU test is The Batman Part II in October 2027.