Duckman - Season 3 Episode 12
The Once and Future Duck

Ajax opens a rift in the time/space continuum with his clock radio. Duckman discovers from a future version of himself that his future hinges on Charles and Mambos tuba recital. Unfortunately Duckman tries to use these visits from his future selves to make a his decisions and suddenly discover every little decision he makes has a big impact on his future.