I'm thinking a time travel event! Avian and Totoro were using their new time machine, to test it out before they jumped for vacation! All of the smoothians stowed away in their luggage to get into the time machine as well! We go back in time to witness crazy things (ie., the big bang, dinosaur extinction, the first humans.) maybe later the machine goes haywire and we see the future on accident with pets that 'weren't supposed to be released for 20 years!'
I dunno. It sounded pretty cool in my head 😂