That's just a little montage of me testing out the new big potion, which you can get by using the code "bignsmall".
One warning: so far I've been unable to enter buildings through doors while using the "big" goodie. But it sure is awesome to ride around as a giant Ghost Rider, and just imagine what would happen if you used it on Giant-Man!
Some info: You CAN switch heroes and stay big once you use the potion.
I haven't yet used the small potion, I'm saving that for a special occasion. ;)