Futurama Episodes

A big piece of garbage that was released a thousand years ago is now on the way to Earth to destroy it. After Fry, Leela and Bender fail on placing a bomb on it, the city has to build another big piece of garbage; yet that may be a problem since trash doesn’t exist in year 3000.
wikipedia.org summary:
After forgetting to bring an invention to an academic symposium and being humiliated by his arch-nemesis, Wernstrom, Farnsworth discovers another invention he attempted to substitute, the “Smell-O-Scope”, and uses it to discover than an enormous ball of garbage that was launched into space in the year 2000 is now on a collision course back to Earth. The Planet Express crew is sent to destroy it in space with explosives, but Farnsworth blunders the installation of the bomb’s timer and the plan fails. In desperation, Farnsworth proposes they deflect the ball into the Sun by launching another ball of garbage into it. Fry teaches the city how to make garbage, since everyone forgot how to do so over the centuries. The plan succeeds while the new ball flies out into the solar system, and Farnsworth regains his honor.
imdb.com summary:
When a big ball of garbage from the 21st Century returns to threaten New New York, Philip is the only expert on making the weapon to fight it.
tv.com summary:
A big piece of garbage that was released a thousand years ago is now on the way to Earth to destroy it. After Fry, Leela and Bender fail to place a bomb on it, the city has to build another big piece of garbage; yet that may be a problem since trash doesn’t exist in year 3000.