Some of the family is tested on obtaining their own sources of food for the castle while Brent Sr. and Dawn Marie build a catapult to be able to defend the castle from intruders when the end times come. Lindsey and Ashley find a sustainable food source while Brent II and Michael hunt for a meal. The entire family tests the catapult together and then feasts on their new food options.

A military expert is brought in to train the family on how to defend the Castle as it stands now. The family comes together to build a solar powered water system. However, tensions flare when communication is broken down and the family can't work together. Their military training is tested and things come to a head when a mock ambush pushes the family to their limits.

A torrential downpour gives the kids time to have some fun in the mud. What starts out as fun and games turns into the breaking point for Ashley as Lindsey and Dawn-Marie gang up on her. Tensions run high and the family splits apart as fights, sometimes physical, develop. Ashley, Michael and Brent II work on a listening post/observation post in the woods while Brent Sr. and Dawn-Marie continue work on a portcullis, an iron grating suspended in the gateway of the castle.