This is how Legend of the Dark Spark and The Dark Spark Vault goes in Rise of the Dark Spark.
[We see a statue of Optimus Prime holding the Matrix of Leadership]
Optimus Prime: (voice) The Matrix of Leadership, formed from Primus himself, grants the bearer the wisdom of the Primes.
[We see a statue of Megatron holding the Dark Spark]
Megatron: (voice) But for every force in the universe, there is an equal and an opposite. For every matter, an anti-matter.
[We see the Dark Spark]
Optimus Prime: (voice) Legends speak of the Dark Spark: the antithesis to the Matrix of Leadership.
Megatron: (voice) Where the Matrix grants wisdom, the Dark Spark empowers its master to bend the very fabric of the universe and its inhabitants to his will.
[We see Cybertron]
Optimus Prime: (voice) This is our darkest hour. Cybertron has nearly fallen and the Autobots are on the verge of defeat.
Megatron: (voice) This is our finest hour! Cybertron is nearly ours and victory is finally within the Decepticons' grasp!
[Rise of the Dark Spark]
[We see Shockwave and Starscream flying through the gates of Crystal city]
Shockwave: The gates of Crystal City lay beyond this chasm.
Starscream: Tell me, Shockwave. Do you believe this "Dark Spark" even exists?
Shockwave: I do not believe, Starscream: I hypothesize. My conclusion is not yet formed, but all data leads us here.
Starscream: Ah yes, ever the scientist.
Shockwave: As you once were.
Soundwave: Conversation irrelevant, danger imminent.
Starscream: For once we agree, Soundwave.