What if... Tony Stark got stuck in the past?

Five years after Thanos used the infinity stones to erase half of the universe's population, Tony Stark is approached to help the Avengers in achieving time travel via the Quantum Realm. Tony refuses initially, however he eventually gets to work and quickly succeeds in creating a time travel device. In this reality Tony impulsively tests his device, sending him back in time to approximately 1,000,000 B.C. Tony is stranded in this time and encounters many surprises in this pre-historic era.