  We study the Klein-Gordon equation with general interaction term, which may
be linear or nonlinear, and space-time dependent. The initial data is general,
large and non-radial. We prove that global solutions are asymptotically given
by a free wave and a weakly localized part. The proof is based on constructing
in a new way the Free Channel Wave Operator, and further tools from the recent
works \cite{Liu-Sof1,Liu-Sof2,SW2020,SW2022}. This work generalizes the results
of the first part of \cite{Liu-Sof1,Liu-Sof2} on the Schr\"odinger equation to
arbitrary dimension, and non-radial data.
