A screenshot from the episode.
"Castleblanca" is a Halloween episode of the animated TV series Cyberchase, which originally aired on January 22, 2002.
Plot
In their quest to rescue the important cyber-scientist Dr. Marbles, the three children and Digit travel to the creepy country of Castleblanca. They must use data collection and data graphing to figure out which creepy castle Dr. Marbles is in before The Hacker transfers his brain into a diabolical robot and takes over Cyberspace.