'House of Anubis: What If...?' is the collection of alternate universes that share a universal hierarchy within the House of Anubis franchise. A large variety of these universes were born due to a major decision on the part of a character. Some can seem to be taking place in the past or future due to differences in how time passes in each universe. Often, new universes are born due to time traveling; another name for these new universes is an "alternate timeline."