The live-action and animation hybrid movie is something of a dicey prospect. It’s tricky to create believable interaction between what’s real and what’s drawn, puppeteered or rendered—and blending the live and the animated has so far resulted in wild swings in quality. It is a highly specific and technically demanding niche, one with only a select few major hits, though plenty of cult oddities. So what makes a good live-action/animation hybrid?

To borrow words from Pete’s Dragon.

Lowery’s dragon is realized with highly realistic lighting and visual-effects work. By comparison, the cartoon-like characters in the 1977 Tom and Jerry replicating the look of 2D through 3D/CGI animation, specifically harkens back to the shorts of the 1940s and ’50s.

One type of live-action/animation hybrid focuses on seamless immersion, the other is interested in exploring the seams themselves. Ninjababy, a Letterboxd favorite from this year’s SXSW Festival, employs an animated doodle as a representation of the protagonist’s state of mind while she processes her unplanned pregnancy.

Meanwhile, every Muppets film ever literally tears at the seams until we’re in stitches, but, for the sake of simplicity, puppets are not invited to this particular party. What we are concerned with here is the overlap between hand-drawn animation and live-action scenes (with honorable mentions of equally valid stop-motion work), and the ways in which these hybrids have moved from whimsical confections to nod-and-wink blockbusters across a century of cinema.

Early crossovers often involve animators playing with their characters, in scenarios such as the inventive Out of the Inkwell series of shorts from Rotoscope inventor Max Fleischer and his director brother Dave. Things get even more interactive mid-century, when Gene Kelly holds hands with Jerry Mouse in Anchors Aweigh.

The 1960s and ’70s deliver ever more delightful family fare involving human actors entering cartoon worlds, notably in the Robert Stevenson-directed Mary Poppins and Bedknobs and Broomsticks, and Chuck Jones’ puntastic The Phantom Tollbooth.

By comparison, Mary Poppins’ excursions into the painted world—replicated in Rob Marshall’s belated, underrated 2018 sequel, Mary Poppins Returns—are full of magical whimsicality. “Films have added the gimmick of making animation and live characters interact countless times, but paradoxically none as pristine-looking as this creation,” writes Edgar in this review. “This is a visual landmark, a watershed… the effect of making everything float magically, to the detail of when a drawing should appear in front or the back of [Dick] Van Dyke is a creation beyond my comprehension.” (For Van Dyke, who played dual roles as Bert and Mr Dawes Senior, the experience sparked a lifelong love of animation and visual effects.)

Generally speaking, and the Mary Poppins sequel aside, more contemporary efforts seek to subvert this feeling of harmony and control, instead embracing the chaos of two worlds colliding, the cartoons there to shock rather than sing. Henry Selick’s frequently nightmarish Sally Jane Black describes it as “riding the Burton-esque wave of mid-’90s mall goth trends and blending with the differently demonic Dahl story”.

Science-classroom staple The Spongebob Squarepants Movie (2004) turns its real-life humans into living cartoons themselves, particularly in a bonkers sequence featuring David Hasselhoff basically turning into a speedboat.

The absurdity behind the collision of the drawn and the real is never better embodied than in another of our highest-rated live/animated hybrids. Released in 1988, Robert Zemeckis’ The Thief and the Cobbler), and his close collaborator Roy Naisbitt. The forced perspectives of Naisbitt’s mind-bending layouts provide much of the rocket fuel driving the film’s madcap cartoon opening.

Distributed by Walt Disney Pictures, Roger Rabbit utilizes the Disney stable of characters as well as the Looney Tunes cast to harken back to America’s golden age of animation. It continues a familiar scenario where the ’toons themselves are autonomous actors (as also seen in Friz Freleng’s 1940 short You Ought to Be in Pictures, in which Daffy Duck convinces Porky Pig to try his acting luck in the big studios).

Adult audiences are catered for with plenty of euphemistic humor and in-jokes about the history of the medium. It’s both hilarious (“they… dropped a piano on him,” one character solemnly notes of his son) and just the beginning of Hollywood toying with feature-length stories in which people co-exist with cartoons, rather than dipping in and out of fantasy sequences. It’s not just about how the cartoons appear on the screen, but how the human world reacts to them, and Zemeckis gets a lot of mileage out of applying ’toon lunacy to our world.

The groundbreaking optical effects and compositing are excellent (and Hoskins’ amazing performance should also be credited for holding all of it together), but what makes Roger Rabbit such a hit is that sense of controlled chaos and a clever tonal weaving of violence and noirish seediness (“I’m not bad… I’m just drawn that way”) through the cartoony feel. And it is simply very, very funny.

It could be said that, with Roger Rabbit, Zemeckis unlocked the formula for how to modernize the live-action and animation hybrid, by leaning into a winking parody of what came before. It worked so perfectly well that it helped kickstart the ‘Disney renaissance’ era of animation. Roger Rabbit has influenced every well-known live-action/animation hybrid produced since, proving that there is success and fun to be had by completely upending Mary Poppins-esque quirks. Even Disney’s delightful 2007 rom-com Enchanted makes comedy out of the idea of cartoons crossing that boundary.

Even when done well, though, hybrids are not an automatic hit. Sitting at a 2.8-star average, Joe Dante’s stealthily great SilentDawn states that the film deserves the nostalgic reverence reserved for Space Jam: “From gag to gag, set piece to set piece, Back in Action is utterly bonkers in its logic-free plotting and the constant manipulation of busy frames.”

With its Tinseltown parody, Back in Action pulls from the same bag of tricks as Roger Rabbit; here, the Looney Tunes characters are famous, self-entitled actors. Dante cranks the meta comedy up to eleven, opening the film with Matthew Lillard being accosted by Shaggy for his performance in the aforementioned Scooby Doo movie (and early on throwing in backhanded jokes about the practice of films like itself as one character yells, “I was brought in to leverage your synergy!”).

Nowadays, when we think of live-action animation, it’s hard not to jump straight to an image of Michael Jordan’s arm stretching to do a half-court dunk to save the Looney Tunes from slavery. There’s not a lot that can be fully rationalized about the 1996 box-office smash, Space Jam. It is a bewildering cartoon advert for Michael Jordan’s baseball career, dreamed up off the back of his basketball retirement, while also mashing together different American icons. Never forget that the soundtrack—one that, according to Benjamin, “makes you have to throw ass”—includes a song with B-Real, Coolio, Method Man and LL Cool J.

Space Jam is a film inherently born to sell something, predicated on the existing success of a Nike commercial rather than any obvious ion for experimentation. But its pure strangeness, a growing nostalgia for the nineties, and meticulous compositing work from visual-effects supervisor Ed Jones and the film’s animation team (a number of whom also worked on both Roger Rabbit and Back in Action), have all kept it in the cultural memory.

The films is backwards, writes Jesse, in that it wants to distance itself from the very cartoons it leverages: “This really almost feels like a follow-up to Looney Tunes: Back in Action, rather than a predecessor, because it feels like someone watched the later movie, decided these Looney Tunes characters were a problem, and asked someone to make sure they were as secondary as possible.” That attempt to place all the agency in Jordan’s hands was a point of contention for Chuck Jones, the legendary Warner Bros cartoonist. He hated the film, stating that Bugs would never ask for help and would have dealt with the aliens in seven minutes.

Space Jam has its moments, however. Guy proclaims “there is nothing that Deadpool as a character will ever have to offer that isn’t done infinitely better by a good Bugs Bunny bit”. For some, its problems are a bit more straightforward, for others it’s a matter of safety in sport. But the overriding sentiments surrounding the film point to a sort of morbid fascination with the brazenness of its concept.

Cool World’s awkwardness can be attributed to stilted interactions between Byrne, Pitt and the animated world, as well as studio meddling. Producer Frank Mancuso Jr (who was on the film due to his father running Paramount) demanded that the film be reworked into something PG-rated, against Bakshi’s wishes (he envisioned an R-rated horror), and the script was rewritten in secret. It went badly, so much so that Bakshi eventually punched Mancuso Jr in the face.

While Cool World averages two stars on Letterboxd, there are some enthusiastic holdouts. There are the people impressed by the insanity of it all, those who just love them a horny toon, and then there is Andrew, a five-star Cool World fan: “On the surface, it’s a Lovecraftian horror with Betty Boop as the villain, featuring a more impressive cityscape than Blade Runner and Dick Tracy combined, and multidimensional effects that make In the Mouth of Madness look like trash. The true star, however, proves to be the condensed surplus of unrelated gags clogging the arteries of the screen—in every corner is some of the silliest cel animation that will likely ever be created.”

There are even those who enjoy its “clear response to Who Framed Roger Rabbit”, with David writing that “the film presents a similar concept through the lens of the darkly comic, perverted world of the underground cartoonists”, though also noting that without Bakshi’s original script, the film is “a series of half steps and never really commits like it could”. Cool World feels both completely deranged and strangely low-energy, caught between different ideas as to how best to mix the two mediums. But it did give us a David Bowie jam.

Craft is of course important, but generally speaking, maybe nowadays a commitment to silliness and a sincere love for the medium’s history is the thing that makes successful live-action/animation hybrids click. It’s an idea that doesn’t lend itself to being too cool, or even entirely palatable. The trick is to be as fully dotty as Mary Poppins, or steer into the gaucheness of the concept, à la Roger Rabbit and Looney Tunes: Back in Action.

It’s quite a tightrope to walk between good meta-comedy and a parade of references to intellectual property. The winningest strategy is to weave the characters into the tapestry of the plot and let the gags grow from there, rather than hoping their very inclusion is its own reward. Wait, you said what is coming out this week?