Time Capsule

S2 E32: The gang puts their favorite items in a Time Capsule to send 100 years in the future, but they get stuck inside right before the door seals. Dr Fox tries to convince the gang to let her use their favorite items to escape the capsule, and each character tells a story about their favorite (and why Dr Fox can't destroy it to escape). Finally, it's revealed that Unikitty's favorite thing was friendship and she trapped everyone in the capsule on purpose, so the future could see their friendship!