The anti-Trump Resistance involves activists from an unusually wide range of political and chronological generations: movement veterans from the 1960s and 1970s, Generation X activists politicized in the 1980s and 1990s, Millennials who entered activism in the 2000s, and newcomers of all ages. Political generations differ in worldview based on both age and time of entry into activism. Generational spillover—the mutual influence, difference, and conflict among political generations—includes explicit attempts to teach organizing, and indirect influences on frames, organizational structures, tactics, ideologies, and goals. This chapter discusses generational spillover in the Resistance, including transmission and conflict.