Lawn Defense Part 1 - Dawn of a Legend

So this is a story based on the events of Plants vs. Zombies. It focuses on a boy, Tom, moving into Suburbia and learning the art of Zombotany (Using plants to kill zombies) from his crazy neighbor, Crazy Dave.
== The Story ==
The time is the 5th of May 2009 at 1:37 PM.
Tom had only just moved into Suburbia. It was a nice place, the parents said. That day, his parents had gone to meet the locals, and so Tom was home alone. It was then when he would go toe-to-toe with the undead.
That afternoon, he was doing what any thirteen-year-old would do, just lazing about and watching the bowling channel. He heard a growl from the front lawn. He opened the door and saw... a ZOMBIE! Tom looked terrified as he watched it shuffle down the yard, but just then he saw a seed packet hurled at his feet. The seed packet had a picture of a plant with a round, green head, long stem and happy eyes, and "Peashooter" was written on the top of the seed packet. Probably the name, Tom thought. He planted one of these Peashooter seeds on the lawn and it instantly sprang into life. It looked just like it did on the seed packet. The Peashooter started shooting peas at the zombie, but these peas were massive, about the size of Tom's hand, and the zombie easily fell at the hands of this Peashooter.
Tom cheered at his victory, unknowingly, the first of many, and then a man walked onto the lawn. He seemed pretty normal, except he had a pot on his head.
"Who are you?" Tom asked.