Twinkle Seas is recessive to Odyssey Carnival. (My own proof.... seems like a post a lot for other people.)
First: Lamar the leprecat hides the Twinkle Seas.
LamarHidesTwinkleSeas
When Lamar is mated with a cat showing the Odyssey Carnival, the Carnival shows on the kitten. When Berry is mated with a Tranquility-eyed puller, the kitten show's Berry's hidden which is the Twinkle Seas.
TwinkleSeas<OdyCarnival
Strictly speaking, we didn't need the pull on this one, since we knew Lamar had to have thrown his Twinkle Seas, but there ya go.