''Roobarb'' is a cult British animated series (a milestone due to being the very first of its region for that matter) that ran for 30 episodes in 1974.

Each of the five-minute stories involves the antics of eccentric lime green dog Roobarb, often taking on some new elaborate pastime and letting his imagination get the best of him, often dragging his sometimes antagonist-sometimes friend, Custard the next-door cat, into the misadventure, and the unruly birds act as a GreekChorus to whole endeavour.

The series was created and written by Grange Calveley and animated by Bob Godfrey, who utilized a distinctive rough style with a sketchy felt marker technique (a style he would reuse for a later project, ''HenrysCat'').

The show had a more obscure run in the US, with dubbed episodes appearing as segments of ''Series/EureekasCastle''.

The show would be revived in 2005 as ''Roobarb and Custard Too'', a 39 episode series (also penned by Calveley) which was thoroughly loyal to the original, outside a few extra characters and modernized plots. A series of books have also been published.

Both series were narrated by Richard Briers, who passed away on February 17th 2013, with Bob Godfrey following four days after.
This series provides examples of:
* AscendedExtra: Custard only had brief cameos or passing mention in the first few episodes, rarely even having a speaking role outside his manic laughter. As time passed, his roles got larger, to the point he became the second most prominent character on the show (and was promoted to co lead for the revival).
* AllJustADream: "When It Was Night"
* AnimationBump: ''Roobarb and Custard Too'' is digitally animated so, while trying to replicate the original felt marker style as much as possible, it is clearly smoother and crisp in comparison to the original hand drawn series.
* BreakoutCharacter: Custard, who gained his own leading roles and was promoted to title character for the revival.
* BunglingInventor: Roobarb.
* ButtMonkey: Roobarb is often the target of heckling by Custard and the other animals whenever his zany schemes go awry. Custard himself sometimes gets the short end of the straw as well, if usually in karmic fashion.
* CatsAreMean: Custard, albeit moderated with JerkWithAHeartOfGold moments.
* CatsAreSnarkers
* {{Cloudcuckoolander}}: Roobarb
* GainaxEnding: The final episode of the original series, "When There Was a Big Mix Up", ends with Roobarb inadvertently hypnotizing everyone, with insane consequences.
* IdiosyncraticEpisodeNaming: Each episode begins with the prefix "When..."
* {{Jerkass}}: Custard, half the time.
** JerkWithAHeartOfGold: He's this the other half.
* LineBoil: An pioneering example of the style!
* NotSoAboveItAll: Custard usually acts as a cynical heckler to Roobarb's antics, though isn't immune to the odd make-believe himself. Roobarb [[WhosLaughingNow takes much amusement out of this]] in the Role Reversal episode "When Custard Stole The Show".
-->'''Roobarb:''' Carry on like this and one day you might get your own TV series.
* TheFaceOfTheSun / TheManInTheMoon: One or the other usually shows up whenever a daytime or nighttime shot is required.
* TheRival: Custard
* ScrewySquirrel: Custard often takes pleasure sabotaging whatever odd scheme Roobard is currently up to.
* ThemeNaming: Rhubarb and Custard is a popular sweet flavor. Almost certainly played into the show's FanNickname.
* VitriolicBestBuds: Roobarb and Custard
* WideEyedIdealist: Roobarb