Team Flash is down by one when The Flash returns for Season 4 to The CW. Tom Felton's troubled CSI Julian Albert will no longer be part of the team when the series returns, and is neither signed on as a series regular or currently signed on for any return to the show at all, EW reports.
The character of Julian went through several changes throughout last season. Brought into Barry Allen's life after the events of the one-episode "Flashpoint" universe shake-up, Julian was Barry's new CSI partner, and his distaste for Barry's flighty life and suspicious methods was clear from the get-go. Later, he was revealed to be the big bad of the first third or so of the season, Doctor Alchemy, though even Julian didn't know he was masquerading as a plague doctor, giving people super powers (using the Philosopher's Stone -- Harry Potter just follows this guy around!), and working for the self-proclaimed "god of speed," Savitar.
After being "cured" of his Alchemy identity, Julian slowly became a full-fledged member of Team Flash, and started a romantic relationship with Caitlin Snow that eventually helped her return from her own evil persona Killer Frost - see how that all comes full circle? He was part of the team that said goodbye to Barry as he made the sacrifice of going into the Speed Force prison so the whole universe didn't collapse. Yeah, it was a wacky season.
Now Felton will not return, after The Flash makes a six-month time jump (popular with comic book shows; Gotham will also jump forward a few months this season and Arrow has done the same). What that means to the Team Flash dynamic as a whole could be a bit of "back to basics" for them, though this does leave Caitlin's personal life in flux once again, too. Gypsy (Jessica Camacho) will have a larger recurring role this season, as her father, played by Danny Trejo, will be a recurring antagonist on the show.
The Flash returns to The CW October 10, 2017 at 8 p.m. ET/PT.