UNKNOWN Conflict View Graph ger_conflictarc_b0722cb7340c 1 event across 1 season Involved Characters Professor Marius Arc Timeline Season 15 1 event S15E8 · The Invisible Enemy Part 4 Doctor confronts Nucleus in Isolation Ward The Doctor enters the Isolation Ward expecting to stop the Nucleus’s breeding program only to find Professor Marius fully enslaved by the alien entity. As the prawn-like Nucleus reveals its … Start