Speaking to IGN at E3, developer Vicarious Visions explained that the reason Coco Bandicoot is now playable in the first two Crash games in the upcoming N. Sane Trilogy is time travel.
'Time travel solves everything,' Kara Massie, producer on Crash Bandicoot N. Sane Trilogy said. 'So, [we have] the save/load screen. She's hacking in with her pink laptop and you see shots of the first two games [appear].'
Coco, who wasn't playable in the original Crash Bandicoot or Crash Bandicoot 2: Cortex Strikes Back, can now transport between any of the games thanks to a 'similar interaction point in all three hubs of all three games,' as Massie puts it.
On top of that, Massie pointed out that the team just wanted to make it happen, so time was made for them to create new animations for dying, standing still, attacking enemies, and jumping.
Crash Bandicoot N. Sane Trilogy is scheduled to be released on June 30 on PlayStation 4.