Arthur
Season 2, Episode 10 of 20 :  D.W. Goes To Washington/Arthur's Mystery Envelope

D.W. gets lost during a tour of the White House. A kind employee reuni tes her with her family and invites them all in for pizza -- but doesn 't that guy look a little ... familiar? In part two, when Mr. Haney gi ves Arthur a sealed envelope to bring home, Arthur fears the worst.