The series season one premiered in the UK in September 2001 on Cartoon Network (UK) and on February 2, 2002 on CBBC on BBC One respectively and has reached high popularity with children. Season one ended on 21 June 2002. A second season premiered in Autumn 2003. Season 2 finished in 2003. Season 3 started in 2004 and ended in 2005. Season 4 began in 2006 and ended that same year. The show is currently licensed to Cartoon Network.
The only known controversy about the series was due to a scene in the episode "Count Crampula". In the scene, Mr. Pretty tells the class to respect culture and individuality. Shortly afterwards he shouts at Lawrence Yaku (a Sikh student) for wearing a Turban and then calls him baldy. In the CBBC viewing of the episode, the scene has been edited out, however it is available in the UK version of Cartoon Network. In the BBC version viewing of the episodes, it has been edited instead it shows Mr. Pretty begging down to his parents for forgiveness.
This show was originally canceled in the US in February 2005, when Mew Mew Power (aka "Tokyo Mew Mew") was airing in its slot February 19, 2005, and it was originally intended to be a sneak peek for the series to air September 2005 with Cramp Twins continuing to air there, but 4Kids TV decided to cancel The Cramp Twins to put Mew Mew Power in its slot. A press release went out about a possible 3-part finale answering any unanswered questions, but the show returned in the summer of 2006, and later with more new episodes.