Arco is a warm, colourful family adventure that makes hope feel reasonable. Ugo Bienvenu gives its children enough curiosity to carry us through, though the time-travel rules and comic adults need more work.
Arco is worth an evening for anyone drawn to gentle family science fiction. Ugo Bienvenu builds an adventure around the idea that rainbows might be travellers from the future, then gives the children more to worry about than the workings of time travel. The environmental danger matters, but it does not make every encounter a lesson in despair. We liked the film most when it let curiosity and affection take their time; the more familiar business of comic adults and pursuit is less rewarding.
The hand-drawn animation gives us good reasons to keep looking. The backgrounds are densely worked, and the contrasting worlds feel worth exploring before anyone explains what has happened to them. The attention to natural environments makes the environmental concern persuasive: there is something here we would regret losing. Some of the character animation feels stiff beside those surroundings, particularly when comedy requires a quickness that the figures do not always have.
Arco (Oscar Tresanini) and Iris (Margot Ringard Oldra) give the film its strongest reason to continue. Their interest in one another is engaging without having to be made precocious, and the film allows their growing connection to matter. We were moved by their attachment to the AI-powered nanny robot. The children depend on its care, and their affection makes that dependence easy to understand. There is room here for a machine to be comforting without making the world around it safe.
The screenplay, by Ugo Bienvenu and Félix de Givry, is less sure when it has to explain how this adventure works. The time-travel rules remain vague, so we spend too much effort wondering what is possible when we should be following the children. A family film need not supply a technical manual, but we should understand enough to know why an obstacle is difficult to overcome. Too often, the warmth has to carry passages that would benefit from clearer writing.
Nathan Jacquard and Ugo Bienvenu edit with enough patience for the friendship, although the film sometimes stalls when it should be gathering speed. At 89 minutes, it has little need to hurry, but the comic adult trio still take up more space than their jokes earn. The chase material is similarly ordinary, particularly beside the invention of the backgrounds. Arnaud Toulon’s score is most persuasive alongside the children’s affection, where its warmth has something specific to support.
The larger disappointment is how readily the story settles into familiar family-adventure patterns. A premise this strange invites us to expect more surprises than the script delivers, and the troublesome adults offer little resistance worth thinking about. Still, Ugo Bienvenu takes children’s concerns seriously enough to let the environmental trouble remain troubling. Even in the sweeter passages, the children inhabit a world affected by climate catastrophe and dependent on technology.
We would choose Arco for a family evening with children who enjoy exploring an unfamiliar place as much as following a plot. Leave some time afterwards for their questions about the future; the film gives them reasonable cause for both worry and hope. Anyone expecting tightly worked science fiction should lower that expectation before settling in.