Aww, man! It would've been awesome to see Baxter go fly man in live-action, in my honest opinion.
The Baxter in question is actually African American in the comics, and never transformed into a fly (Ditto the new cartoon, where he becomes Shredder's whipping boy, before working for Bishop). In fact. Issue #2 is where they introduce him and April, who is actually his lab assistant. Of course, Baxter is behind a huge conspiracy, and April gets wise to it. Suffice to say, the mousers are then programmed to attack her.