To date no explanation has been given. In "School Reunion" it is directly stated that neither the Doctor nor Sarah Jane remember meeting again after "The Hand of Fear", even though they did, also in "The Five Doctors" (and notwithstanding encounters in assorted comic strips and novels). It is possible to speculate why this is the case, but speculation is not allowed on this part of the site. All that is known is that, for some reason, Sarah Jane (and, it appears, the Doctor) do not remember the events of "The Five Doctors" - even though a clip from that episode is included in "Death of the Doctor" when the Doctor instructs Sarah Jane to remember her past adventures, although that story does take place after "School Reunion" so she may have regained her memories.

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