It seems like FoxBox WILL show the entire first espiode of Sonic X. Check this article out:
“Fans of the FOX BOX do not have to wait until September 1 to see the television block’s new programming offerings. Instead, the network will air special “sneak previews” of their three new series throughout August. Sonic X, Funky Cops and Shaman King will all having special airings during the month before their official debut on September 1.
Sonic X
Episode #101 “Supersonic Hero Appears”
(Saturday, August 23–10:00 a.m. ET/PT)
In this premiere episode, Sonic and Eggman fight over the possession of the seventh Chaos Emerald, the legendary stone that is said to give its possessor the power to rule over the entire world. With the support of his friends, Tails, Amy, Cream and Cheese, Sonic storms into Dr. Eggman’s base. Meanwhile, all seven Chaos Emeralds are brought together, causing a large-scale Chaos Control warp in space, blowing away Sonic and his friends, who land in a world of humanoids setting the stage for a series of exhilarating and elaborate adventures.”
Source: Animation Insider