The Space Bikers run a school in their home planet. They do everything to benefit their society. On weekends, they take their stress out on Earth.
Sheldon expresses a near-obsessive infatuation for Jenny, but he was quick to fall for Vexus when she swindled him (and even tried to share a romantic dance with a toaster when Jenny wasn't dancing with him at a party). Does Sheldon really love Jenny, or are his feelings solely based on both desperation and robot fetishism?
Applicability: "Victim of Fashion" has Jenny competing against Brit and Tiff to see who can be more fashionable. But when it comes to getting slim, being a robot her only option is having her armor and weapons removed leaving her body as just a robot skeleton. She's so weak that even the smallest member of the biker chicks gang kicks her butt easily. Of course this could be seen as An Aesop about function over fashion which can easily apply to technology, but the way Jenny gets slimmer can also read as a metaphor for anorexia.
Sheldon. Beyond being the cause of the majority of the fandom's shipping arguments (Jenny/Brad vs Jenny/Sheldon), there are those who see him as a shallow creep and those who think he's an absolute sweetheart, especially with him being the only one who actually believes Jenny was innocent in the Christmas episode.
Some hate The Crust Cousins for being so darn cruel to Jenny but with that being said, there are people who love them and/or just their wardrobe.
The "Happy Noontime Funtime Song" in The Wonderful World of Wizzly.
The random song Brad and Jenny sing in Humiliation 101
Casual Interstellar Travel: Played with Depending on the Writer. There was an entire episode devoted to Sheldon's galactic adventures, with a serious case of time dilation. At least one episode shows Tuck and Brad going to other worlds via Jenny's umbilical spacesuit.... thingy and until she's stranded it's treated with all the gravity of a road trip.
Counterpart Comparison: Sheldon Lee, in a way, is similar to Philip J. Fry. Both characters have very similar clothing, are friends with robots (Sheldon with Jenny and Fry with Bender) and always try to win the heart of their love interests (Jenny and Leela, respectively), which mostly end up failing.