You and the professor have driven your DeLorean back to the past to fix issues with the spacetime continuum caused by your time traveling. But another DeLorean appears with older versions of you and the professor. The professors panic and explain that the universe could collapse now that you’re both in the same time and place. Can you merge the timestreams and travel home? Dan Finkel shows how. Lesson by Dan Finkel, directed by Igor Coric, Artrake Studio.