GameTrailers' Geoff Keighley brings us plenty of exclusive new footage from Mass Effect 3 (including our very first look at Mars) and separate interviews with creative director Casey Hudson and lead writer Mac Walters in the latest episode of GT.TV. Casey talks a bit about the storyline in the threequel, the role that Illusive Man will play this time around, and how multiplayer will function, while Mac discusses the importance of Mars and how we'll be using Prothean technology to take down the Reapers.