It's one thing to try and take over a city. It's another thing to just try and level it. That's what the monsters are trying to do and the Power Rangers are trying to stop in this new Heroes of the Grid scenario, available to download now for free from Renegade Game Studios.
From the announcement:
The forces of evil have arrived and they’re playing for keeps this time. Where once, their plan was to sow chaos and panic throughout the Earth’s cities, now they’ve come to simply destroy it all and rule over the ashes. Foot soldiers and monsters arrive en masse, destroying buildings and industrial centers in a terrifying show of force! You must stop them quickly! Download Scenario #17: Wrecking Crew now!