"Do you have sssome sssugar we could borrow?"
Star brings the Diaz family over to Mewni as a last minute anniversary present. However, while there Star and Marco have to protect them from some of the more dangerous creatures in the forest, and avoid being spotted by Star's dad King Butterfly.
After defeating a hydra, they run into King Butterfly, who reveals that just like Star, he finds palace life boring and occasionally sneaks away from his wife to have adventures and fight monsters. He agrees to look the other way and not tell Queen Butterfly that Star disobeyed them by breaking her exile.
Tropes:
- Blah, Blah, Blah: Star gets really bored with her dad's conversation about his throne posture lecture and starts hearing his words as this.
- Blatant Lies: Star does not have inter-dimensional scissors! They are normal Earth scissors! Her parents don't look too convinced.
- Brain Bleach: Marco, after seeing his dad naked.
- Chekhov's Gun:
- The items in Marco's fanny pack later prove useful in dealing with the monsters they encounter in the Forest of Certain Death.
- When Star's dad is about to bust her for sneaking back onto Mewni, she asks him why he's not at his "throne posture" lecture that he talked about earlier.
- Coat Full of Contraband: Mr. and Mrs. Diaz encounter a shady-looking guy in a long-coat selling clocks and other merchandise.
- Commonality Connection: Star and her dad bond over their love for hunting monsters.
- Convection, Schmonvection: Marco's blanket is apparently fire- and heat-proof, as it protects both him and Star from the hydra's fire breath.
- "Could Have Avoided This!" Plot: Marco keeps telling Star that the fanny packs can be from both of them. He keeps saying it as they go to Mewni.
- The Darkness Gazes Back: There are ominous pairs of red eyes in every dark corner of the Forest of Certain Death.
- Did Not Think This Through: Star taking Marco's parents on a trip to Mewni, after receiving a lecture from her parents to stay on Earth and not travel anywhere. Keeping the Diazes from her home palace is not enough to ensure discretion, since her dad is apparently out in the same area.
- Disney Death: Marco's parents seem to suffer this when Marco thinks a monster ate them, and he can't find them in the hydra's stomach.
- Does This Remind You of Anything?: The merchant with the Coat Full of Contraband is shown from behind when he first opens his coat—for a moment, it looks very much like he's flashing them. For bonus points, Mr. and Mrs. Diaz immediately start snapping pictures.
- Don't Go in the Woods: The Forest of Certain Death.
- The Dung Ages: Apparently the peasants in Mewni live like this.
- Failed a Spot Check: Star's parents somehow don't see the portal that Star accidentally conjures up while she tries to pass off the Dimensional Scissors as normal scissors.
- Fan Disservice: Marco's parents get naked to soak in a hot tub. Marco suffers Brain Bleach as a result.
- The Fool: Marco's parents don't notice the dangers Marco and Star protect them from.
- Foreshadowing: When Marco finds his parent's stuff, it includes his dad's neatly-removed shirt.
- Hawaiian-Shirted Tourist: Mr. and Mrs. Diaz wear Hawaiian shirts for their trip to Mewni.
- I Don't Like the Sound of That Place: The Forest of Certain Death.
- Impossibly-Compact Folding: Marco manages to pull out and unfold a whole blanket from a tiny belt pouch.
- In the Blood: Monster hunting runs in the Butterfly family. Star and her dad bond over it after he chews her out for breaking the rules.
- Knotty Tentacles: Star and Marco defeat the hydra with quick maneuvers to tie its necks up into a knot.
- Mix-and-Match Critters: The pig-goats kept by the peasants of Mewni.
- Naked People Are Funny: Mr. Diaz is more or less unconcerned with whoever sees him in just his fanny pack.
- Nature Tinkling: Marco mentions to have done this while in the Forest of Certain Death.
- Not This One, That One: Shortly after their arrival on Mewni, Mrs Diaz asks Star if it's where she grew up. Star tells her that she grew up in a castle. She points upwards, and the Diaz family gasp with awe at a fancy castle. Star tells them to look higher, and the camera pulls back to show an even bigger, fancier castle behind that one. Star tells them to look even higher, and her actual castle is shown, towering over the second one.
- Parental Sexuality Squick: When Marco goes to give his gift to his parents, Mrs. Diaz is pawing at her husband's chest hair, and the two are humming and giggling to each other. Marco's visibly not happy to see this.
- Properly Paranoid: Marco in the Forest of Certain Death. He evades all the traps with ease thanks to his caution, while trying to catch up to his parents.
- Reasonable Authority Figure: Subverted. Although King Butterfly and Star bond, the real reason he's not going to bust her is because she can bust him in turn to the queen.
- Sickening Sweethearts: Marco's parents. Marco reacts just as well as a normal kid would to seeing such public affection.
- Swallowed Whole: The hydra apparently doesn't digest its food well or chew, as it has a number of unharmed peasants in its stomach.
- You Didn't See That: King Butterfly tells Star that she didn't see him out hunting when he claimed he was giving a throne-posture lecture, and in return he didn't see her on Mewni when she was supposed to stay on Earth.
