IBM - Mr. Fong's Space Quiz
This IBM website featured an actor playing multiple characters (or multiple versions of the same character, really) and encouraged users to play a choose-your-own-adventure type game. The project received a warm welcome and won a number of awards including an ECHO and B to B Magazine "Best Of" distinction.
Fun fact: These were shot by Jeremy Saulnier, acclaimed director of the films "Blue Ruin" and "Green Room."