I would go into the future, get some high tech shit then go into the past and give that technology to some random hobo on the street and hopefully he knows what to do with it the go get Jesus and bring him to the present and see what happens.
When you say Arnie, do you mean present day Arnie, or 80's 'built like a brick **** house" Arnie? 'Cause if you're going back to the 80's to pick him up, I've got a list for you