Lil doesn't want to act like twins anymore, she would rather do things on her own without Phil. Soon after, Dil recruits himself as Phil's new twin. However, Lil's new attitude is threatening the family's trip to the Twins Canyon theme park, where twins get in for half-off, if they dress alike.

Meanwhile, Chuckie refuses to participate in the mandatory President's physical education exam.

When Betty and Chazz take Tommy, Phil and Chuckie to the great outdoors for rafting Tommy's secret fear of the water is exposed and tested after getting lost. When he was young he had a near death experience and almost drowned, ever since then he's been afraid of the water. But when Phil's life is in danger and Chuckie is too scared to help him out, Tommy must put aside his fears to try and save his friend.