This group is the mane 3 (left to right) Treble Sea and Ark. Treble and Sea are sibling and Sea is the youngest and Treble is the oldest. Sea is the leader of the mane 3. This is the the male version of the mane 6.
Part one One day in Ponyville the mane 6 randomly went missing but no one knew. Then the mane 3 got suspicious about their friends not answering their doors so the mane 3 peeked through the window of Elusive's house and knocked on their door for a while but no one answered. Sea: It looks like no one's home Treble: where could they be Ark: do you think they've gone missing? Sea: let's go check the other houses Narrator: They checked all of their houses but no one was home Have the mane 6 really gone missing!?
Part one
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