  We discuss pair production and decays of stops, sbottoms, and staus in
$e^+e^-$ annihilation in the energy range $\sqrt{s}$ = 500 GeV to 2 TeV. We
present numerical predictions within the Minimal Supersymmetric Standard Model
for cross sections and decay rates. We study the stop discovery potential for
$\sqrt{s}$ = 500 GeV and $10~\fb^{-1}$ integrated luminosity with full
statistics background simulation.

High Energy Physics - Phenomenology