The stage has a singular main platform with two smaller platforms at the very ends, similar to Kalos Pokémon League. The background depicts the events at the end of Final Fantasy VII, where Cloud Strife and his party set off to defeat Sephiroth. The platforms stay frozen in place regardless of the background events, making it similar to Final Destination in this regard.
Ω form and Battlefield form
The main platform of the Ω form and Battlefield form is identical to how it appears in the normal form, due to matching the shape and size of that of Final Destination and Battlefield. The three soft platforms of the Battlefield form also resemble the floating soft platforms of the normal form.
Since Northern Cave lacks any hazards to begin with, no changes are made when hazards are turned off.
Northern Cave is the final dungeon of Final Fantasy VII, located in a crater at the northern reaches of the world. The crater was created two thousand years ago when the alien lifeform Jenova crashed into the planet. Cloud and his party arrive here to defeat Sephiroth after the murder of Aerith Gainsborough, only to be manipulated into handing over the Black Materia to Sephiroth's real body, which was encased in a mako cocoon. Upon receiving the Black Materia, Sephiroth summons Meteor, a massive comet which he intends to use to wipe the planet of all life. He places a barrier over the Northern Crater to prevent interference from the Weapons, powerful lifeforms that defend against threats to the planet.
The party learns from the sage Bugenhagen that Sephiroth's will is holding back Holy, a spell Aerith had managed to cast before her death—and the only thing that can stop Meteor. After Shinra's Sister Ray pierces the barrier over the crater, the party enters the Northern Cave for a final confrontation with Sephiroth. When they defeat his Bizarro and Safer forms, the party believes the threat of Sephiroth to be over, but Cloud passes out and has one final confrontation with him within his mind. Upon Sephiroth's final defeat, Holy activates and the party scrambles to escape in their airship, the Highwind. It seems that all is lost and Holy is too late to stop Meteor's impact, but the planet's Lifestream rises up to aid Holy. The Super Smash Bros. stage depicts the Highwind entering Northern Cave, the activation of Meteor, and the intervention of both Holy and the Lifestream.
The original game's ending is ambiguous as to what happened after the Lifestream intervened, only featuring a scene set 500 years later where party member Red XIII is seen approaching the ruins of Midgar, but later entries in the Compilation of Final Fantasy VII series make it clear that Meteor was stopped in time to prevent Sephiroth's plan for mass extinction — though not without damage to the planet — and that humanity also survived.
Northern Cave has previously appeared as a stage in the Dissidia: Final Fantasy series of arena-based fighting games. This specific version of Northern Cave was referenced in Ultimate by the background after descending into the crater and immediately before the scene of Holy being activated being directly based on the former's layout and design.
Due to the lack of stage hazards and a layout similar to Kalos Pokémon League, several players have suggested legalizing the stage. Compared to Kalos Pokémon League, the blastzones are smaller, while the platforms are lower and stick less out from the edges, and the stage doesn't have vertical walls; overall, these changes might make the stage less favorable for camping than Kalos Pokémon League. However, there have been some concerns that the background is too visually busy and distracting, especially during the meteor section. Due to the COVID-19 pandemic still putting offline tournaments on hold, the legal status of the stage is still unclear.
Names in other languages