User blog comment:BananaGummyBear64/PvZ 2 World 4/@comment-16728651-20130828163407

When I finished the third world, the stargate opened immediately, then there was a cutscene in which Penny received a message from the future, saying that the future was full of risk, and you could enter if you are willing to support it, the message was from Dr. Edgar Zomboss. I got really excited, and I was already going to go, but it won't let me D: hope this information helps, apparently no one else has seen this cutscene.