Striking themes of existentialism, authoritarian reign and destruction to the family unit are all tackled throughout in a pragmatically cold and shameless way, owing credence to the film's overt testimony to topics such as climatology and scarcity threats. Altin has been open about her intentions in conveying the thematics of the film, with the director expressing how the film tackles a global issue.
In fact, Once Upon a Time in the Future: 2121 belongs to a budding trilogy, with the other future narratives being 'Young Revolution: 2071' and 'Heavenly World: 2222'. As such, 2121' marks itself as being ambitious and certainly not afraid to delve into its storytelling-world-building-plot. For instance, the main characters are incredibly well fleshed-out, with the film fully diving deep into the relationships between the characters, allowing for the family dynamics on display to be compelling and emotional, in turn heightening the stakes to an extremely tense level.