  Universal Extra Dimensions (UEDs) with compactification radius near the TeV
scale provide interesting phenomenology at future colliders. The collider
signals of the first Kaluza-Klein (KK) level are very similar to those of a
supersymmetric model with a nearly degenerate superpartner spectrum. The
heavier first level KK states cascade decay to the lightest KK particles (LKP),
which is neutral and stable because of KK-parity. The signatures involve
missing energy and relatively soft jets and leptons which can be difficult for
detection. The KK electron signal in $e^- e^-$ collisions is free from the
problematic two photon background therefore provides a unique opportunity for a
detailed studies of the KK electrons in the Universal Extra Dimension scenario.
