Dark Dreams - Septiplier
Everyone's favorite hero Mark is the smiling face of YouTube, bright and bubbling over with cheeriness and the optimism everyone knows him for. Yet, things are not always as they appear on the outside. Mark struggles to deal with problems of the past, finding it hard to sleep and relying on his friends more and more for comfort, striking up curiosity and worry within them all.
Finally, Jacksepticeye himself makes an appearance in America wanting to help Mark, only to find out he became involved with something a lot bigger than he expected. Mark's life hangs by a thread, and the only way to save him is through dreams even darker and more dangerous than reality.
And Jack is the only one who can fight his way through.