As mentioned in the synopsis, the main plot of the movie revolves around Littlefoot and his friends encountering a new dinosaur named Ali. Although she is shy and initially struggles to fit in with the group, they quickly become friends. However, their newfound happiness is short-lived as the Great Valley is hit by a severe drought.
As if the drought wasn't bad enough, strange mists begin to appear in the valley, making it difficult for the dinosaurs to navigate and hunt. When Littlefoot's grandfather falls ill, he must embark on a dangerous journey to find a rare flower that can cure him. Ali joins him on his quest, and along the way, they encounter a group of dinosaur elders who warn them about the dangers of the journey.
The two young dinosaurs eventually make it to the distant land where the flower grows, but they are confronted by a hostile group of fierce dinosaurs who want to claim the flower for themselves. With the help of some unexpected allies, Littlefoot and Ali manage to retrieve the flower and return to the Great Valley just in time to save Littlefoot's grandfather.
Overall, the Land Before Time IV continues the series' tradition of exploring environmental themes and showcasing the power of friendship and perseverance. The introduction of a new character adds some fresh dynamics to the cast, and the film's heartwarming ending will leave viewers satisfied.