All the Presidents' Heads
When you go back in time to beat up your ancestor, you have to do it carefully unless you want to end up using the metric system! [spooky music plays]. That's just what Professor Farnsworth does in order to save his family name.
Other talking points are... shark jumping and also a lot of time travel philosophy. You might also accidentally learn something about history in this episode! It's edutainment!
Ben becomes a philosophy professor. Mike becomes Dilbert.
Music at the end of the episode is "Super Sunday" and used with permission. "Super Sunday" is provided by http://www.freesfx.co.uk.