A Throwback Too Far

As adults, Dennis and Walter become employed at the same intelligence agency. They are begrudgingly put together for a mission concerning a time machine by their boss, in the hopes that they'll learn to get along. When they are revealed to the man with the time machine, they are pushed in and sent back to 1865, never to be heard from again. Luckily, the inventor of the time machine finished constructing it in 1864 so all they have to do is find him and return to their time. However, this mysterious inventor is proving rather hard to find. Dennis and Walter are forced to see past their differences and help each other and even become rather close. Possibly too close.