I'm remembering bits and pieces of a story I enjoyed some time back.
A fella is dropped on a dangerous planet for the entertainment of another planet full of people stuck inside due to pollution. (Think it's a multiverse environment).
As soon as he's dropped off he has to deal with some dangerous animals, lions I think.
Lots of other groups are dropped on the same planet as well, and various entertainment channels/groups specialise in one group or another.
I think I remember him fighting a dragon in a town.
He finds a way to mess with them, and they send executives to negotiate/threaten him.
At one point, he ends up having to deal with Nazis on a planet that had a zombie outbreak.
It's really frustrating me that I can't find it again, thanks in advance for any help.