  In first-order inflation a phase transition is completed by the collisions of
expanding true-vacuum bubbles. If bubble collisions produce large numbers of
soft scalar particles carrying quantum numbers associated with a spontaneously
broken symmetry, then symmetry restoration may occur in a ``pre-heating'' phase
in a manner similar to symmetry restoration in the pre-heating phase of
slow-roll inflation. Since bubble collisions lead to inhomogeneities, there is
the possibility of inhomogeneous symmetry restoration where restoration occurs
only in the regions of wall collisions.
