He first appears, during the meeting in London, where The Queen of England herself was present along with Integra Hellsing, the head of Hellsing Organization and Enrico Maxwell the Head of Iscariot Section XIII and Alucard Pip and Seras who came in later.

Schrodinger appears to deliver a message from Major, confirming, that the war is going to break out soon. After viewing the message, Integra orders Alucard to shoot Schrodiger. After getting shot in the mouth his body dissapears and reappears in Millenium headquaters, where he delivers the response to The Major.

He also appears delivering another message from the Major to Alucard after he killed Rip van Winkle and became trapped on the ship, in the middle of the see.

During Zorin Blitz' attack on London he appears in Zorin's mind to tell that she failed and disobeyed Major's orders and is going to die a painful death.

When Alucard is fighting against Walter, Schrodinger commits suicide, therefore destroying Alucard, becuase as he said: "I am everywhere and nowhere"