  We investigate the filtered theory corresponding to the universal sl(2) foam
cohomology $H_{a,h}$ for links, where a and h are complex numbers. We show that
there is a spectral sequence converging to $H_{a,h}$ which is invariant under
the Reidemeister moves, and whose E1 term is isomorphic to Khovanov homology.
This spectral sequence can be used to obtain from the foam perspective an
analogue of the Rasmussen invariant and a lower bound for the slice genus of a
knot.
