This is how Optimus and Twilight lose their memories goes in One Shall Rise Part 3.

[Megatron gets up, rubs his head, then looks at Twilight and Optimus]

Megatron: Teamwork? Ha.

[Megatron approaches the two, sword drawn]

Optimus Prime: Where are we, Megatronus?

Twilight Sparkle: And what happened?

[Megatron looks confused for a moment, then realizes what's happened. He puts his sword away and helps the two to their feet]

Megatron: Don't you remember, old friends?

[The door falls down]

Bulkhead: Optimus, you alright?

Applejack: You okay, Twi?

Optimus Prime: Why did he call me that?

Twilight Sparkle: And why did she call me Twi?

Arcee: What did you do to them?

Rainbow Dash: Yeah.

Twilight Sparkle: Who are they?

[Decepticon Groundbridge appears]

Megatron: Our mortal enemies. We're outnumbered. Go, I'll cover you.

[Before entering the Groundbridge, Optimus and Twilight look back at Bumblebee and Rarity. Bee bleeps something and Rarity just stares wide-eyed. Optimus and Twilight then go into the Groundbridge]

[After a short battle with them, Megatron enters the groundbridge. Ratchet bridges the team back and they have a little conversation]

Ratchet: Optimus and Twilight. Are they...?

Arcee: Dead? No.

Bulkhead: But they looked right at us without recognizing us. Didn't even know their own names.

Ratchet: If Twilight and Optimus did not know their own names, they lost more than just the collectable wisdom of the Primes and Alicorns. They lost their own memories.

Arcee: What?

Bulkhead: Are you serious?

Rainbow Dash: Whoa.

Ratchet: I know it may seem downing right about now but we need to pull through it. With or without them.

Applejack: Don't say that.

Rainbow Dash: Twilight. [looks up]

[In space]

Knock Out: Welcome back, Lord Megatron.

[Breakdown sees Optimus and Twilight and charges]

Megatron: At ease, Breakdown. That is no way to welcome long lost comrades. Orion Pax and Nightfall Twinkle are one of us.

[To be continued...]

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