12 Monkeys!!

Another amazing web series on Time Travel, though it doesn't have any major flaws but small errors can be seen if watched carefully. Initially, a team of scientists from the future send a traveler to kill a person who was suspected to spread a virus which would gradually become a global pandemic, and a cure to the virus was never found because of it's high mutation level. On the mission, the Traveler comes across a secret organization which plays

a major role in the pandemic.

With time, the main lead aka James Cole falls in love out of time, historic tales and cults are revealed and cycle always continue...

If you enjoyed DARK then you must watch it. I liked it more than DARK because of 2 reasons, firstly because the Director made it light and cleared most of the suspense in the same season unlike DARK. Many people didn't watch DARK because it was confusing and secondly because it was actually impossible to create two linked world's with time travel by a slight error in a scientist's calculation for a machine.

4th Season is the last season with 11 episodes.