Tom Felton swung by a screening of his 2002 blockbuster Harry Potter And The Chamber Of Secrets at which a live orchestra played the score over the film.
He has maintained a steady flow of work since the Harry Potter movie series has wrapped up, starting with Rise of the Planet of the Apes.
The first look at 's Kim Engelbrecht will be the new Big Bads this year as The Thinker and his genius engineer The Mechanic.
Other villains lined up for the autumn episodes include Danny Trejo as the cosmic bounty hunter Breacher and the return of Peek-a-Boo (Britne Oldford).
Unbeknownst to him, Julian had become the human vessel for Doctor Alchemy and had been re-awakening the powers of those evil meta-humans whose lives had been torn apart by the Flashpoint paradox.
However, Julian ultimately joined forces with Caitlin Snow (Danielle Panabaker) and the STAR Labs team when they helped him realise that he was being used by the speed god Savitar against his will.