This is how Megatron returns goes in Darkness Rising Part 1.

[Soundwave plays a recording]

Starscream: Those transmissions are emanating from deep space. I would hate to waste the energon unless you are absolutely certain.

[Soundwave nods]

Starscream: Then lock on transmission coordinates and activate the space bridge.

[Soundwave does so]

[In space, the Spacebridge opens and a fighter jet zooms out. It turns into Megatron]

Megatron: Decepticons! I have returned.

[To be continued...]

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