Battle Through Time

You are a scientist in the distant future, trying to go back in time to save Earth from destroying itself. After finding the needed crystal to achieve time travel, you place it into the frame of the portal.

However the crystal was heavily cracked in the process of transporting it, causing the machine to malfunction in the process, sending you to the past to an unknown time. Now you must battle your way through many different eras, to find the stray portal, and make it back to your own time.

And hopefully the next attempt at time travel, will be more successful. And let's hope you didn't change the course of history...