Mighty Jack #1

At the insistence of his sister who almost never speaks, Jack swaps the keys to his mother's car for a box of strange seeds, creating financial disaster. Jack and Maddy plant the seeds, which grow into a garden of strange and even dangerous plants, which they explore with the help of neighbor Lilly. Finally Jack destroys the garden as too dangerous, but Maddy plants the last pack of seeds. These spawn a monster that drags her our of our world. Lilly outfits herself and Jack with renaissance fair armor, plus energy drinks made from the garden plants, and they pursue the monster and Maddy.