  We study the dynamics of colliding domain walls including self-gravity. The
initial data is set up by applying a BPS domain wall in five-dimensional
supergravity, and we evolve the system determining the final outcome of
collisions. After a collision, a spacelike curvature singularity covered by a
horizon is formed in the bulk, resulting in a black brane with trapped domain
walls. This is a generic consequence of collisions, except for non-relativistic
weak field cases, in which the walls pass through one another or multiple
bounces take place without singularity formation. These results show that
incorporating the self-gravity drastically changes a naive picture of colliding
branes.
