What I was thinking:
RP starts with a scene where the gang are standing at Saurus Rock, saying how amazing it is to spend a day without Rhett (they ditched him)
Then Littlefoot says if the lone dinosaur is truly protecting the Valley then he should turn up and chase Rhett away
On the next day, no less than Doc shows up! The Gang confront him about Rhett and, surprisingly, Doc accepts and they start planning their scheme.
Then Rhett chase
Then whatever you guys want to do after that

I would volunteer to write the introduction post and if anyone wants a character I play just say so