If you liked
Heppoko Jikken Animation Excel♥Saga
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...then you might like
Gintama°
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Excel Saga is best described as Gintama before Gintama. Without Excel Saga, there wouldn't really be a Gintama. Both are goofy parody type anime- Gintama parodies more specific anime whilst Excel Saga likes to parody genres in general. Both have a story, however it only begins to move at the end of the series. If you like Gintama and can't wait until it's next season, consider watching Excel Saga.