Explained

Transformers (part 4)

After the Fallen was defeated, Optimus Prime found Sentinel Prime (the commander of the Ark) and he used the matrix  to revive him

Here he is

The humans forced the Autobots to leave Earth. So they did but they is one more thing I have not mention in part 3 Optimus said that if they leave they will regret it which they did because the Decapticon took over Earth. OH yeah I forgot to mention that there’s some new bots

  • Leadfoot
  • Tospin
  • Roadbuster
  • Dino (Mirage)
  • Que (Wheeljack)
  • Brains

And Decapticons

  • Shockwave
  • PhotoTypes
  • Crankcase
  • Crowbar
  • Hachet
  • Driller
  • Igor
  • Laserbeck
  • Soundwave

Sentinel made a deal with Megatron. Then Optimus killed Sentinel