Goodbye Earth

The MBC is infected by an alien virus. In order to quarantine them, the clubhouse was sent to outer space. This episode is made up mostly of flashbacks on the MBC's adventures showing how they got infected in the first place, but also focusing on the personalities of the team, and also notably insisting on the importance of team work to solve problems (many sequences show how MBC could capture aliens on uniting their strengths). Mr. Smith then uses his Rhapsodian healing powers to cure Danny, Chris and Sam, but fails in curing Cathy. It appears that the virus can't be extracted from Cathy's human body : so she has to transform back into her Rhapsodian form and concentrate hard to expel the virus. Once it's out of her, Cathy turns back into human & the team blasts the virus, which automatically ends quarantine. The clubhouse can now safely return to Earth. Note: This is the series finale. (this is episode 52 on DisneyXD USA)