As the Great Day of the Flyers nears, the Great Valley's flying youngsters are eager to participate in the annual exhibition to show off their skills. Everyone, that is, except free-spirited pterodactyl Petrie, whose individualism causes problems when it comes to staying in formation. Enter his dinosaur pals Littlefoot, Cera, Spike and Ducky, who encourage Petrie to embrace his uniqueness.

A new case for the cult detectives! Not by coincidence, a mysterious videotape falls into the hands of Jupiter Jones, Pete Crenshaw and Bob Andrews during Jupiter's birthday party in Rocky Beach. On it is a recording of Jupiter's long dead parents. In their message they want to communicate to their son the key to an especially tricky riddle.

"I Want a Dog for Christmas, Charlie Brown!" centers on Rerun, Linus and Lucy's lovable but ever-skeptical younger brother. It's Christmas vacation, and as usual, Rerun's big sister is stressing him out, so he decides to turn to his best friend, Snoopy, for amusement and holiday cheer. However his faithful but unpredictable beagle companion has plans of his own, giving Rerun reason to ask Snoopy to invite his canine brother Spike for a visit. When Spike shows up, it looks like Rerun will have a dog for Christmas after all - but then the real trouble begins.