The employees race back to the science lab .
The employees are held up by Mr. Ross and future Mordecai , allowing past Mordecai and past Rigby to botch the time machine and create the Time - nado .
The employees race back to the science lab but are held up by Mr. Ross and future Mordecai , allowing past Mordecai and past Rigby to botch the time machine and create the Time - nado .