Lucky Luke (english version) - Volume 60 - The Ballad of the Daltons

A lawyer visits the Daltons in prison to explain that an uncle has bequeathed
a fortune to them, but that they will only have access to it after shooting
every member of the jury who sentenced him to hang – andthat in front of a
very specific witness: Lucky Luke. One prison escape later, the four brothers
are riding hard with a list of men to kill – and a more or less captive Lucky
Luke intent on making their task impossible...