Air date: September 20, 2003
Scott Menville - Robin
Tara Strong - Raven
Greg Cipes - Beast Boy
Khary Payton - Cyborg
Hynden Walch - Starfire
Ron Perlman - Slade
Director(s) - Michael Chang
Storyboarder(s) - Anthony Chun, Mike Goguen, Steve Jones, Shaunt Nigoghossian
Writer(s) - Greg Klein, Tom Puglsey
Summary: Robin has become more obsessed about finding out who Slade is. He stays out often while the Titans go on missions, leaving them worried for him. Meanwhile, an agile criminal calling himself Red X is hired by Slade to steal a computer chip. He seems to be a match for the Titans. But is there more to the new villain than they realize?
- At the end of the episode when Slade and Robin are battling on the rooftop, the Chinese words in the background read "Kan Man Hwa", meaning "Read comics" in traditional script.
- One of the movies Beast Boy suggests watching is a spoof of Godzilla.
- Speaking on the episode, producer and story editor David Slack said, "'Masks' was a turning point....Cartoon Network asked us to do something you rarely get asked to do; we were asked to take risks. Sam said 'I want you to do things you’re not supposed to do.” So there are things that don’t normally happen in kids’ cartoon shows—such as the way Starfire leaves Robin at the end. She’s basically saying, 'You disappointed me. You screwed up.'"
- Slack spoke on Slade: "Originally, we weren’t envisioning [Slade] to be as scary as he later became. For someone who writes kids cartoons, I have a surprisingly dark sensibility. I’ve told Sam and Glen a number of times, 'I’ll go as dark as you let me. Just tell me when I’m getting too scary'....Originally, we didn’t even know we would do an arc with Slade. We just decided Slade would be behind everything....But after looking a few episodes, we decided we were teasing something. And if we didn’t pay it off, we were going to disappoint a lot of people. That’s when we got into the psychology of Slade. We had a really hard time figuring out how 'Masks' and 'Apprentice' were going to work. We went down a lot of blind alleys and dead ends—trying to find something that fit. It was actually Bruce Timm who helped us make the breakthrough on that one.”