Keiynan Lonsdale
“The Flash” actor Keiynan Lonsdale opened up about what it’s been like to work with “Harry Potter” alum Tom Felton in Season 3 of the CW series. Pictured: Lonsdale attends the “Allegiant” New York Premiere at AMC Loews Lincoln Square 13 theater on March 14 in New York City. Getty Images/Mark Sagliocco

“The Flash” actor Keiynan Lonsdale opened up about what it’s been like to work with Tom Felton, who was cast as a series regular in Season 3 of the CW series.

In an interview with “The Lowdown with Diana Madison,” Lonsdale — who has already worked with Felton “a little bit” — said that the 29-year-old British actor is “killing” his new role on “The Flash.”

“He’s just an awesome guy,” the 24-year-old Aussie actor said of Felton. “He’s super cool. He’s an awesome laid-back dude.”

Lonsdale, who plays Wally West/Kid Flash on the series, added that it didn’t take long before Felton fit in with the cast. “The first time I met him was at Comic-Con,” Lonsdale recalled. “So we’re just all together … like eight of us or whatever, and we’re all like this big family straightaway, and he just fit it day one. It’s really cool.”

“Hopefully [I would be able to work with him] more as the season goes on,” Lonsdale added.

Felton — who is best known for his role as Draco Malfoy in the eight installments of the “Harry Potter” film series — plays Julian Albert on “The Flash.” Julian is a CSI at the Central City Police Department who suspects that there’s more to Barry Allen (Grant Gustin) than just his good guy reputation. The casting call for Felton’s role revealed that the new character “sets out to learn what Barry is hiding — all while concealing some secrets of his own.”

In an interview with SciFiNow last August, Felton said that Julian and Barry initially have an “abrasive relationship.”

“He’s a forensic expert, so he treads on the toes of much of what Barry is good at. Hence, they have a slightly abrasive relationship at first,” Felton explained. “I say abrasive, but I mean that — clearly because of the events of the season — none of the relationships that Barry has had with other cast members is the same.”

“He’s not familiar with me, but I’m familiar with him, so it’s an odd dynamic,” he added. “It seems like a love / hate thing at first.”

Felton is set to make his series debut as Julian in Season 3, episode 2 of “The Flash,” which airs on Tuesday, Oct. 11 at 8 p.m. ET on The CW.