It's winter in Woodland and Franklin is excited about spring coming because his new baby sister will be born. Following the lead of a myth his mom told him, he assumes the role of a Knight and sets out to the woods on a quest for spring.
The main plot focuses around Franklin Turtle and his friends starting a new year of school after a fun and relaxing summer, only to find out that their teacher Mr. Owl is absent because he got called away on a family matter. Their replacement teacher, Miss Koala from Australia, pulls up on a motorbike and at first Franklin finds her weird. She uses phrases such as "fair dinkum" and wants to create a brand-new soccer team. Soon, however, he and everyone else in the class are won over by her "can-do" attitude.
The movie opens with black and white and a young female turtle with glasses burying a green box. The scene zooms out to a turtle shaped lake, then we see a picture of it as we hear a fire and someone shouting "Mother! Father!" before it then perishes on Granny Turtle, who wakes from a bad dream, and sighs sadly. The scene then pulls us to Franklin, Beaver and Snail playing pirates, and they were about to go to a tree with an X. Just as they were about head towards there, Bear appears playing the villainous captain and Franklin defeats him. After that, the four went home. Franklin and Snail walk by Franklin's Aunt Lucy's place and notice the door was open. They went inside to see if Aunt Lucy was home, but instead someone in a mask scares them off and they run away. As they run off, the someone in behind the mask reveals to be a female turtle with a pink bonnet on the head. two run, where Franklin's parents and sister Harriet get a message of Lucy, with no post or stamp. When Franklin revels what happened, Jonathan soon gets the answers and they walk around the house, where Lucy appears to be. Lucy was at Granny Turtle's (hers and Jonathan's mother) and promised to invite the turtles over.