S04E15: Ghost of Butterfly Castle
Moon revisits the Butterfly Castle ruins to discover an item she left behind, but she is soon surprised.
Previous Episode 
Season 1
Star Comes to Earth
S1E1 / 18 Jan 2015
Party With a Pony
S1E2 / 18 Jan 2015
Match Maker
S1E3 / 30 Jan 2015
School Spirit
S1E4 / 30 Jan 2015
Monster Arm
S1E5 / 06 Apr 2015
The Other Exchange Student
S1E6 / 06 Apr 2015
Cheer Up Star
S1E7 / 13 Apr 2015
Quest Buy
S1E8 / 13 Apr 2015
Diaz Family Vacation
S1E9 / 20 Apr 2015
Brittney's Party
S1E10 / 20 Apr 2015
Mewberty
S1E11 / 15 Jun 2015
Pixtopia
S1E12 / 15 Jun 2015
Lobster Claws
S1E13 / 22 Jun 2015
Sleep Spells
S1E14 / 22 Jun 2015
Blood Moon Ball
S1E15 / 20 Jul 2015
Fortune Cookies
S1E16 / 20 Jul 2015
Freeze Day
S1E17 / 27 Jul 2015
Royal Pain
S1E18 / 27 Jul 2015
St. Olga's Reform School for Wayward Princesses
S1E19 / 10 Aug 2015
Mewnipendance Day
S1E20 / 17 Aug 2015
The Banagic Incident
S1E21 / 17 Aug 2015
Interdimensional Field Trip
S1E22 / 14 Sep 2015
Marco Grows a Beard
S1E23 / 14 Sep 2015
Storm the Castle
S1E24 / 21 Sep 2015
Season 2
My New Wand!
S2E1 / 11 Jul 2016
Ludo in the Wild
S2E2 / 11 Jul 2016
Mr. Candle Cares
S2E3 / 18 Jul 2016
Red Belt
S2E4 / 18 Jul 2016
Star on Wheels
S2E5 / 25 Jul 2016
Fetch
S2E6 / 25 Jul 2016
Star vs. Echo Creek
S2E7 / 01 Aug 2016
Wand to Wand
S2E8 / 01 Aug 2016
Starstruck
S2E9 / 08 Aug 2016
Camping Trip
S2E10 / 08 Aug 2016
Starsitting
S2E11 / 15 Aug 2016
On the Job
S2E12 / 15 Aug 2016
Goblin Dogs
S2E13 / 12 Sep 2016
By the Book
S2E14 / 12 Sep 2016
Game of Flags
S2E15 / 19 Sep 2016
Girls' Day Out
S2E16 / 19 Sep 2016
Sleepover
S2E17 / 26 Sep 2016
Gift of the Card
S2E18 / 26 Sep 2016
Friendenemies
S2E19 / 03 Oct 2016
Is Mystery
S2E20 / 03 Oct 2016
Hungry Larry
S2E21 / 10 Oct 2016
Spider with a Top Hat
S2E22 / 10 Oct 2016
Into the Wand
S2E23 / 07 Nov 2016
Pizza Thing
S2E24 / 07 Nov 2016
Page Turner
S2E25 / 14 Nov 2016
Naysaya
S2E26 / 14 Nov 2016
Bon Bon the Birthday Clown
S2E27 / 21 Nov 2016
Raid the Cave
S2E28 / 06 Feb 2017
Trickstar
S2E29 / 07 Feb 2017
Baby
S2E30 / 08 Feb 2017
Running with Scissors
S2E31 / 09 Feb 2017
Mathmagic
S2E32 / 13 Feb 2017
The Bounce Lounge
S2E33 / 14 Feb 2017
Crystal Clear
S2E34 / 15 Feb 2017
The Hard Way
S2E35 / 16 Feb 2017
Heinous
S2E36 / 20 Feb 2017
All Belts Are Off
S2E37 / 21 Feb 2017
Collateral Damage
S2E38 / 22 Feb 2017
Just Friends
S2E39 / 23 Feb 2017
Face the Music
S2E40 / 27 Feb 2017
Starcrushed
S2E41 / 28 Feb 2017
Season 3
Battle for Mewni: Return to Mewni
S3E1 / 15 Jul 2017
Battle for Mewni: Moon the Undaunted
S3E2 / 15 Jul 2017
Battle for Mewni: Book Be Gone
S3E3 / 15 Jul 2017
Battle for Mewni: Marco and the King
S3E4 / 15 Jul 2017
Battle for Mewni: Puddle Defender
S3E5 / 15 Jul 2017
Battle for Mewni: King Ludo
S3E6 / 15 Jul 2017
Battle for Mewni: Toffee
S3E7 / 15 Jul 2017
Scent of a Hoodie
S3E8 / 06 Nov 2017
Rest in Pudding
S3E9 / 06 Nov 2017
Club Snubbed
S3E10 / 07 Nov 2017
Stranger Danger
S3E11 / 07 Nov 2017
Demoncism
S3E12 / 08 Nov 2017
Sophomore Slump
S3E13 / 08 Nov 2017
Lint Catcher
S3E14 / 09 Nov 2017
Trial by Squire
S3E15 / 09 Nov 2017
Princess Turdina
S3E16 / 13 Nov 2017
Starfari
S3E17 / 13 Nov 2017
Sweet Dreams
S3E18 / 14 Nov 2017
Lava Lake Beach
S3E19 / 14 Nov 2017
Death Peck
S3E20 / 15 Nov 2017
Ponymonium
S3E21 / 15 Nov 2017
Nightlife
S3E22 / 16 Nov 2017
Deep Dive
S3E23 / 16 Nov 2017
Monster Bash
S3E24 / 16 Nov 2017
Stump Day
S3E25 / 02 Dec 2017
Holiday Spellcial
S3E26 / 02 Dec 2017
The Bogbeast of Boggabah
S3E27 / 03 Mar 2018
Total Eclipsa the Moon
S3E28 / 03 Mar 2018
Butterfly Trap
S3E29 / 10 Mar 2018
Ludo, Where Art Thou?
S3E30 / 10 Mar 2018
Is Another Mystery
S3E31 / 17 Mar 2018
Marco Jr.
S3E32 / 17 Mar 2018
Skooled!
S3E33 / 24 Mar 2018
Booth Buddies
S3E34 / 24 Mar 2018
Bam Ui Pati!
S3E35 / 31 Mar 2018
Tough Love
S3E36 / 31 Mar 2018
Divide
S3E37 / 07 Apr 2018
Conquer
S3E38 / 07 Apr 2018
Season 4
Butterfly Follies
S4E1 / 10 Mar 2019
Escape from the Pie Folk
S4E2 / 10 Mar 2019
Moon Remembers
S4E3 / 17 Mar 2019
Swim Suit
S4E4 / 17 Mar 2019
Ransomgram
S4E5 / 17 Mar 2019
Lake House Fever
S4E6 / 17 Mar 2019
Yada Yada Berries
S4E7 / 24 Mar 2019
Down by the River
S4E8 / 24 Mar 2019
The Ponyhead Show!
S4E9 / 24 Mar 2019
Surviving the Spiderbites
S4E10 / 24 Mar 2019
Out of Business
S4E11 / 31 Mar 2019
Kelly's World
S4E12 / 31 Mar 2019
Curse of the Blood Moon
S4E13 / 31 Mar 2019
Princess Quasar Caterpillar and the Magic Bell
S4E14 / 07 Apr 2019
Ghost of Butterfly Castle
S4E15 / 07 Apr 2019
Cornball!
S4E16 / 07 Apr 2019
Meteora's Lesson
S4E17 / 07 Apr 2019
The Knight Shift
S4E18 / 14 Apr 2019
Queen-Napped
S4E19 / 14 Apr 2019
Junkin' Janna
S4E20 / 14 Apr 2019
A Spell with No Name
S4E21 / 14 Apr 2019
A Boy and His DC-700XE
S4E22 / 21 Apr 2019
The Monster and the Queen
S4E23 / 21 Apr 2019
Cornonation
S4E24 / 21 Apr 2019
Doop-Doop
S4E25 / 28 Apr 2019
Britta's Tacos
S4E26 / 28 Apr 2019
Beach Day
S4E27 / 28 Apr 2019
Gone Baby Gone
S4E28 / 28 Apr 2019
Sad Teen Hotline
S4E29 / 05 May 2019
Jannanigans
S4E30 / 05 May 2019
Mama Star
S4E31 / 05 May 2019
Ready, Aim, Fire
S4E32 / 05 May 2019
The Right Way
S4E33 / 12 May 2019
Here to Help
S4E34 / 12 May 2019
Pizza Party
S4E35 / 12 May 2019
The Tavern at the End of the Multiverse
S4E36 / 12 May 2019
Cleaved
S4E37 / 19 May 2019
Eden Sher
Star Butterfly (voice)
Adam McArthur
Marco Diaz (voice)
