Sonic Boom - Season 2 Episode 9 Multi-Tails
Overview: Tails takes a failure during a battle with Eggman to heart. He feels that even though he's the smart one in the group, he's just not smart enough to help Sonic and the gang. So he creates a machine to duplicate himself and form a "brain trust." But will he and his duplicates be smart enough to defeat anything that Eggman can come up with?