Copyright

Not a Place You'll Go: Dr. Seuss v. ComicMix and the Limits of the Mashup

The Ninth Circuit held that a Star Trek-Seuss mashup was infringement, not parody, drawing a hard line between transformation and clever copying.

October 8, 2025
Open illustrated children's picture book lying on a wooden desk
Copying a beloved style to ride its appeal is not parody, and not fair use. Shutterstock
Educational content, not legal advice. This article explains general legal concepts. It does not create an attorney–client relationship. For your specific situation, consult a licensed attorney.

A mashup of Oh, the Places You’ll Go! and Star Trek sounds like a delightful tribute—and that is precisely the problem the Ninth Circuit identified. In Dr. Seuss Enterprises, L.P. v. ComicMix LLC, No. 19-55348 (9th Cir., decided Dec. 18, 2020), the court held that Oh, the Places You’ll Boldly Go! was not a parody, not a transformative fair use, and therefore an infringement of Dr. Seuss’s copyrights. The decision is a sharp counterweight to the expansive readings of transformation that flourished after Cariou v. Prince, insisting that borrowing a famous work’s expressive heart to capitalize on its appeal is the opposite of fair use—no matter how affectionate or creative the result.

At a glance

  • Case: Dr. Seuss Enterprises, L.P. v. ComicMix LLC; David Jerrold Friedman a/k/a David Gerrold; Glenn Hauman; Ty Templeton, No. 19-55348 (9th Cir. Dec. 18, 2020).
  • Court: United States Court of Appeals for the Ninth Circuit; opinion by Judge M. Margaret McKeown.
  • Posture: Reversing the Southern District of California’s grant of summary judgment to ComicMix on copyright fair use; affirming dismissal of the trademark claim.
  • Holding: Boldly was not a fair use—it was non-transformative, copied substantial and qualitatively central material, and threatened Seuss’s lucrative derivative and licensing markets. The Lanham Act trademark claim failed under Rogers v. Grimaldi.
  • Significance: A mashup that merely repackages a beloved work to exploit its popularity, without commenting on it, is infringement, not parody.

ComicMix’s Boldly was the work of accomplished creators: David Gerrold, who wrote the famous “The Trouble with Tribbles” Star Trek episode; illustrator Ty Templeton; and editor Glenn Hauman. They set out to combine the optimistic life lessons of Oh, the Places You’ll Go! with the universe of Star Trek, illustrating the Seussian world in Seuss’s style but populated with Captain Kirk, Spock, and the Enterprise. They launched a Kickstarter, acknowledged internally that they were copying Seuss closely, and even anticipated a possible lawsuit. Dr. Seuss Enterprises sued for copyright and trademark infringement before the book was published.

Why the mashup was not a parody

The fair-use analysis turned first on the parody distinction drawn in Campbell v. Acuff-Rose. A parody copies a work in order to comment on or criticize that work; it must conjure up the original to make its point. The Ninth Circuit found that Boldly did no such thing. It “did not critique or comment on” Oh, the Places You’ll Go!—it simply used Seuss’s expression as a vehicle to tell a Star Trek story. As Judge McKeown put it, Boldly “merely uses Go!‘s characters and the elements of its illustrations to tell a story… ComicMix copied the [original] in order to get attention or to avoid the drudgery in working up something fresh.”

That framing is the doctrinal core of the case. Without commentary on the original, Boldly could not claim parody’s special latitude to take the heart of a work. And the court declined to find the mashup transformative on any other theory. Combining two properties is not, by itself, transformation. The work did not add “new expression, meaning, or message” about Seuss; it imported Seuss’s expression to lend charm and recognition to a derivative project. The first factor therefore weighed against fair use—and the court signaled that ComicMix’s commercial purpose compounded the problem.

The amount and substantiality taken

The third factor proved devastating to ComicMix. The court catalogued exactly how much the mashup had taken: Boldly copied, “as much and as closely as possible,” the illustrations and text structure of Go!, including the layout, the cross-hatching, the iconic shapes, and the sequence of scenes. The panel noted that ComicMix had lifted close to 60% of Go!, plus distinctive illustrations from How the Grinch Stole Christmas! and The Sneetches, characterizing the borrowed material as “the heart” of the Seuss works.

Importantly, the court rejected the argument that heavy copying was justified because the mashup needed to evoke Seuss. That justification works for parody, which must summon the original to mock it. But Boldly was not aiming its copying at Seuss; it was using Seuss to decorate a Star Trek story. Without the parody rationale, near-verbatim reproduction of a work’s most recognizable expression weighed heavily against fair use. The meticulousness ComicMix took pride in—matching Seuss line for line—became evidence against them.

Market harm and the licensing economy

The fourth factor sealed the outcome. Dr. Seuss Enterprises runs an extensive and active licensing and derivative-works business, including authorized collaborations and adaptations. The court emphasized that Oh, the Places You’ll Go! is a perennial bestseller, especially at graduation season, and that Seuss had a established practice of licensing derivative products. ComicMix bore the burden, as the party asserting fair use, of showing the absence of market harm—and it offered no evidence that Boldly would not encroach on Seuss’s derivative markets, including the market for licensed mashups Seuss might itself authorize.

The court was explicit that potential harm to derivative and licensing markets counts, and that ComicMix’s failure to address it was fatal. Because Boldly targeted the same audience that buys Go! as a gift and could substitute for an authorized Seuss-licensed product, the fourth factor favored Seuss. Weighing all four factors together, the panel held the fair-use defense failed as a matter of law and reversed.

Open questions

  • What separates a transformative mashup from a derivative one? ComicMix says combining two works is not automatically transformative, but leaves room for mashups that genuinely comment or recontextualize—an undefined frontier.
  • How heavy is too heavy a take? The court stressed the near-total copying of Go!‘s expression, but did not specify how much less would have changed the calculus.
  • Does failing to prove no market harm doom most defendants? Placing the burden on the fair-use proponent to negate derivative-market harm may make summary judgment harder for appropriators to win.

Implications

  • Mashups are not presumptively fair. Blending properties does not create transformation; courts ask whether the new work comments on the borrowed one or merely exploits it.
  • Parody latitude requires targeting the original. Heavy copying is forgiven only when the copying serves to critique the source, not to borrow its appeal.
  • Active licensing programs strengthen rights holders. A robust derivative-works market makes market-harm arguments potent and shifts practical leverage to the owner.
  • The fair-use proponent carries the burden on market harm. Failing to put on evidence that derivative markets are unaffected can be decisive.
  • Good faith and craftsmanship do not excuse copying. Careful, affectionate reproduction can cut against fair use by proving how much was taken.

Frequently asked questions

Was the Star Trek mashup ever published? No. Dr. Seuss Enterprises sued before publication, and after the Ninth Circuit’s ruling the Supreme Court denied certiorari, leaving the infringement finding in place. The work was not lawfully released.

Why did the trademark claim fail even though the copyright claim succeeded? Under Rogers v. Grimaldi, the use of Seuss’s title style and typeface had artistic relevance to the mashup and was not explicitly misleading about its source, so the Lanham Act did not apply. Trademark and copyright analyses are distinct.

How is this different from Campbell v. Acuff-Rose? In Campbell, 2 Live Crew’s song commented on and parodied the original “Oh, Pretty Woman,” earning parody’s latitude. Boldly did not comment on Oh, the Places You’ll Go!; it used Seuss’s expression to tell an unrelated Star Trek story, so the parody justification was unavailable.

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