New Leaf is a two part episode from the third season of Thorn Valley Chronicles. It serves as the season finale.
Jenner and his followers captured Mrs. Brisby and asked her where the red amulet is. But she refused to let them have it. After letting Mrs. Brisby go - Jenner sent Fidget to spy on Timothy Mouse and capture him. Justin realized that Timothy had been held captived by Jenner. Bris even had a nightmare about her being on Jenner's side. Would Mrs. Brisby save her brother or make a deal with Jenner?
With help from Tom and Jerry - Justin and Mrs. Brisby joined up to save Timothy's life. After defeating Fidget and Jenner's Followers - Bris and Justin met Jenner in a final showdown. With help from Dumbo - Mrs. Jumbo saved Timothy's life and got rid of Jenner by sending him flying over the horizon. After the battle - freedom returned to the valley and The Brisbies (along with Jeremy Justin and Timothy) lived happily ever after.