Since I'm an Aussie, I'm pretty familiar with the Tomorrow series! and I still long for the day when someone will write Animorphs/TWtWB crossover fanfiction Possibly the reason why the Tomorrow books feel less dated is because of the setting, though. While Animorphs is urban, the Tomorrow books take place in the bush and in rural Australia. And as a result of the invasion society pretty much changes completely, so there's much less of a connection to things like the pop culture references that you get in Animorphs.