Towards the end of the sequence, the parkour runner and creature morph into action figures and in a surprise twist, the scenario is just a product of our tutor, Jared's imagination. It was my job to key out the green screen in the close-up shots of both action figures and apply a rendered CGI background.
Here are each of the clips, which have also had the brightness adjusted so they blend in with the environment.
This last shot had a lot of noise in it, so I had to apply a mask, which I then key framed in order to remove some of it. Even then, there was still a bit of noise left in areas that were too close around the action figure to key out adequately. I have found that noise tends to come up on green screen significantly more than blue screen.