Samuel L. Jackson let a little secret out when he appeared on "Late Night With Jimmy Fallon" earlier this week: Nick Fury has a sidekick in "The Avengers."  Marvel Studios won't comment who the character is, but Heat Vision has the four ladies up for major consideration for the part and as you'd expect from director Joss Whedon, they are very geek friendly.  Most notable is "V" evil queen Morena Baccarin who also appeared in Whedon's "Firefly" and "Serenity."  The other three contenders are said to include Mary Elizabeth Winstead ("Scott Pilgrim vs. The World"), Jessica Lucas ("Cloverfield") and Cobie Smulders ("How I Met Your Mother").  Needless to say, Whedon and Marvel better decide soon before Jackson ends up chosing for them.