Mulder and Scully are now on the chase for a convict who’s escaped and now able to walk through solid objects… except glass and rubber. Still Scully isn’t quite sure but lets Mulder’s theory take control when as a last resort she hides in a glass phone box to save her life.. which works out well.
After chasing the bad guy for a while, Mulder sees him literately run through a solid wall, leaving his clothes behind. But it’s the ex-wife who saves the agents in the end by trying to run him over, only to have him make it up to the wind shield when he gets splattered. Nothing massively interesting happens.