  In this work, we build a spectral sequence in motivic homotopy that is
analogous to both the Serre spectral sequence in algebraic topology and the
Leray spectral sequence in algebraic geometry. Here, we focus on laying the
foundations necessary to build the spectral sequence and give a convenient
description of its $E_2$-page. Our description of the $E_2$-page is in terms of
homology of the local system of fibers, which is given using a theory similar
to Rost's cycle modules. We close by providing some sample applications of the
spectral sequence and some hints at future work.
