  We consider the effect of massive spin-2 gravitons that occur as Kaluza-Klein
excitations of the graviton in a Weak scale Quantum Gravity scenario on the
process $\gamma \gamma \to ZZ$, which in the Standard Model can proceed through
loop diagrams. For a wide range of parameters, we show that the massive
gravitons leave behind signatures that should be verifiable in a TeV scale
scattering experiment.
