The Birthday to End All Birthdays, Part 1 (S03E23)

S03E01 Growing Pains S03E02 Wiener Club S03E03 Trapped in the Tower S03E04 Special Delivery S03E05 Scary Tales 2 S03E06 Old Lady Bodyguard S03E07 Too Cool S03E08 Guardian of the Unikingdom S03E09 Cast Aside the Truth S03E10 Unikitty and the Ice Pop Factory S03E11 Sunken Treasure S03E12 Dawn of the Donut S03E13 P.L.O.T. Device 2: Beyond the Bored Dome S03E14 The New Nemesis S03E15 Baby Caterpillar S03E16 Borrowed S03E17 Sick Day S03E18 Best Best Friends S03E19 The Escape Room of Doom S03E20 Last One There S03E21 The Very Best Candy S03E22 The Unikingdom Awards S03E23 The Birthday to End All Birthdays, Part 1 S03E24 The Birthday to End All Birthdays, Part 2