San Diego Comic-Con officially kicked off this morning with a Hall H panel for DreamWorks Animation's latest film, Megamind, but it was Tron: Legacy, one of the most-anticipated films (and sequels) of the year (it's mine, at least where mainstream films are concerned), that most Comic-Con attendees really wanted to see. From real-time twitter updates, the panel featured eight minutes of footage from the native (as opposed to post-production conversion) 3D film, but those of us on the outside looking in (as in not at Comic-Con this year) did get something today: the second theatrical trailer.

The new trailer repeats a few visuals and plot points from the first trailer, confirming what we already know: Tron: Legacy focuses on Sam Flynn (Garrett Hedlund), the 27-year old son of programmer Kevin Flynn (Jeff Bridges), who mysteriously disappeared more than two decades ago. Flynn's old friend and business partner, Alan Bradley (Bruce Boxleitner), an ENCOM senior executive/consultant, contacts Sam about a message he's received via pager, supposedly from Sam's father. Sam enters Flynn's old arcade and, like his father 28 years earlier, he's digitized and enters Tron's virtual world of perpetual combat games.