Complete story — includes the ending
An alien named Orb asks Ben, Gwen and Kevin to help locate his missing best friend, Decka from a greedy mayor named Coleman, who is using him to pay off his debts in gold poop. Later, it is revealed that his species lived in Mars that they refer to as "The Popcorn Planet" sometime in the past and turned it into the Red Planet when one or more members of his kind accidentally ingested meat, causing them to revert to their primal forms and become giant and hostile. When Mayor Coleman feeds Decka meat, it is up to Ben and his team to help Orb save Decka by helping him restore to his normal self again. Ben uses Echo Echo, who is made of silicon, which poisons him and turns him back to normal.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Ben 10: Alien Force episodes. HTML formatting and reference markers removed. · Content license