Visitor X/In the Name of the Museum (来訪者Ｘ／ミュージアムの名のもとに Raihōsha Ekkusu/Myūjiamu no Na no Moto ni) is the thirty-eighth episode of Kamen Rider W. It is the concluding part of the 'X' arc, X standing for Xtreme (Memory) and (Foundation) X.