Canon Invasion is when two unrelated titles are originally owned by two different entities but are forced into the same fictional universe after one buys the rights from the other. Sometimes, it's immediately after; other times, it's Canon Welding belatedly kicking in. The "Invaders" bring their own, possibly conflicting, continuity with them; and since they didn't originate with the same creator, the differences will likely be more severe than with Canon Welding. Expect Retcons, especially if the invaders are inserted directly. Examples of Canon Invasion include: