The Land Before Time (1988)
In the film that started it all. An earthquake separates the main characters from their families, and they set off to reunite with them as they embark on an adventure to The Great Valley. They face dangers such as starvation, Sharpteeth, and splitting up.
Soon after arriving in the Great Valley, the little dinos chase some Egg Stealers into the Mysterious Beyond and discover an egg, mistakenly believing it was Ducky's unhatched sibling who had been stolen, from which a Sharptooth hatches. They call him Chomper, and all is well until he gets interested in Cera's tail and bites it. To add to the trouble, a hole is now in the Great Wall and the Egg Stealers are out for revenge.
The gang is in some trouble with bullies, but then a much bigger problem appears. The Thundering Falls stop and the valley starts drying out. To make things even worse (for the main characters) Cera's grouchy but well-meaning father bans her from playing with Littlefoot!
A herd of farwalker longnecks visits the valley, telling that their homeland was transformed into the Land of Mists. Grandpa Longneck then becomes mortally ill and Littlefoot, along with a young longneck from the herd named Ali, sets out to find the cure: the Night Flower, which grows in... the Land of Mists! Littlefoot goes on an adventure with Ali, except Ali is afraid of his friends... but things change when she must find help to save Littlefoot- and save his grandpa!
Leaf gobblers appear and eat all of the green food in the Great Valley, forcing the herds to leave. The gang set out to find green food so their herds will not break up after a disagreement. While doing this they wind up on an island and meet a friend they have not seen in a while: Chomper!
A large longneck named Doc appears in the valley, and Littlefoot believes him to be the Lone Dinosaur of legend. Later Littlefoot and his friends accidentally break off one of the stone teeth of Saurus Rock when searching for Cera's niece and nephew, Dinah and Dana - who cause trouble for Cera! As told in the legend, bad luck seems to descend upon the valley. Unfortunately, the adults blame Doc!
Littlefoot sees a strange flying rock one night while everyone is sleeping. The valley has some visitors, among them Petrie's uncle Pterano and some Rainbow Faces that seem to talk in riddles and explain that the rock may be a "Stone of Cold Fire". Ducky is taken captive by Pterano and his henchmen and the gang set out to save her from her captors who have set out to capture the stone of cold fire for themselves.
Some Spiketail farwalkers visit the valley. During their visit snow falls upon the valley. Spike, who has befriended Tippy, goes with the Spiketails. Ducky sets out to bring Spike back and the gang set out to save Ducky. Meanwhile, Mr. Thicknose seeks trouble upon Littlefoot, and spills a deep secret.
During a bad rainy season more rain than usual falls upon the Great Valley, so much that it floods part of it. Littlefoot meets a happy, funny talking little ichthyosaur named Mo, but also a huge swimming Sharptooth. An earthshake traps the gang and they go on a journey to get home - returning their new friend on the way. Meanwhile, Cera is an annoyed with Mo, who doesn't want to be serious.
Littlefoot has odd dreams. He finds out his grandparents have also and it means they must set out and travel to a destination they have not seen. His friends set out after he has left to catch up. But a surprise is in store for Littlefoot once he reaches their destination.
It is almost time for the Great Valley herd to eat the special tree sweets that bloom only once a year. Littlefoot accidentally knocks them down and soon after some little Longnecks eat them. Littlefoot blames the little ones for the disappearance of the tree sweets, but soon after makes friends with them. He must make a difficult decision: should he continue to blame them for what he did? Or should he admit that he lied? Meanwhile, Cera's father falls in love with an old friend, Tria, but does Cera agree with having a new mother?
It is an important time for Petrie, and possibly emotional time showing he can fly with his family. Also Cera learns some news concerning her family: a new baby, Tricia! While this occurs they also meet a new friend, Guido, but what is he? No one knows...not even him!
Some goofy Yellow Bellies, Loofah, Doofah, and Foobie appear in the Great Valley. They are trying to find their way to Berry Valley. The gang sets out to help them find their way there. Littlefoot also tries to teach them the Wisdoms.
The Land Before Time XIV: (Unknown Title) (Unknown)
This one hasn't been given a title or release date but I found out about it from the Gang of Five forum and it appears to have been confirmed by an interview from Universal. It is probably in its early stages from what I heard. Gang of Five page confirming movie 14