coun·ter·plot 
(kountər-plŏt′)
(kountər-plŏt′)n.
1. A plot or scheme intended to subvert another plot.
2. See subplot.
v. coun·ter·plot·ted, coun·ter·plot·ting, coun·ter·plots
v.intr.
To oppose or subvert one plot with another.
v.tr.
To plot against; thwart with a counterplot.