Teenage Mutant Leela's Hurdles
Season 5 Episode 7 – first aired on March 30, 2003
The crew's attempts to de-age Professor Farnsworth result in everyone returning to their more youthful stages. While Farnsworth seeks out a way to re-age the crew, the newly-teenaged Leela takes the opportunity to experience the parental childhood she never had.
Oh, I don't have time for this. I have to go and buy a single piece of fruit with a coupon and then return it, making people wait behind me while I complain.