This is a world where everything is made out of Lego (like the LEGO movie). Society is trying to rebuild after the advent of the zombie apocalypse. While there are still zombies out there, there aren't as many as before and they're much further away from society. That said, sometimes a few of them do wander into the towns and cities that remain.

You are on a train on the way to Lego City. However, the train gets hijacked by a bunch of zombies. If the train gets to the city, the zombies will storm out and start attacking. You are one of the few survivors to run away from them and get to another train cart.

BOOM!

A cannon suddenly goes off from the outside and blows a massive hole on the side of the train and takes out a bunch of zombies.

Just then, someone jumps through the hole and boards the train while it's still in motion. He then pulls out his firearm and skillfully takes out some incoming zombies with consecutive head shots. He then looks at you.

"I'm Ace Chaseman! Undercover cop! As long as there's a train, a-chuggin' along these tracks, I'll be there to blow it up! So uh... are you the president?"

Ace looks at you with an awkward pause.

I just woke up after being in a coma for years, so I missed out on everything and no one caught me up on any of it. Instead, the second I woke up they told me I had to save the president and sent me here. But either way, the sooner I find the president, the sooner I can blow this train up!