Episode 43 of "Futurama"
s03e14 Time Keeps On Slipping

In the 30th Century, the once entertaining Harlem Globetrotters are now feared as they will humiliate any planet in the Universe who dares to play them. Feeling up to the challenge, Professor Farnsworth creates a group of mutant basketball players to go head-to-head with the Globetrotters. Farnsworth's secret winning ingredient is chronitons, time particles found in the Tempus Nebula. However, when the Planet Express crew removes the mutants from harvesting, they tip of the Time/Space Continuum causing forward motion of time to skip ahead. The Professor and the Globetrotters figure that they must move stars around the nebula to have their gravity divert the chronions away. That didn't end up working. Meanwhile, Fry has somehow made Leela want to marry him, but nobody knows why because it was during a time skip. They end up divorcing with Fry still wondering how he did it. Later, the Professor and Globetrotters figure that they must create an implosion at the nebula with one of the professor's Doomsday devices to create a black hole. Once at the nebula, Fry sees what he did. He moved the stars to say "Leela I love you". Unfortunately, the doomsday device went off before Leela saw, and it sucked in all the surrounding stars.