This is how Starscream's return goes in Orion Pax and Nightfall Twinkle Part 1.
[Vehicons fly to the Nemesis unaware that Starscream is behind them. Inside, the Vehicons transform but still don't notice Starscream. Starscream transforms and runs through the corridors until he reaches the Energon storage vault where two Vehicons are standing guard. One of them sees him]
Starscream: That's Commander Starscream. What's your malfunction? Lower those weapons immediately.
Vehicon: I'm sorry, sir, but Lord Megatron said you should be taken into custody should you ever return to the ship.
Starscream: What? Clearly, there has been a mistake.
[Starscream makes the lights flicker and takes the Vehicons out with a single swipe. He grabs some Energon from the vault. He hears footsteps and goes into the lab where he finds Nightfall and Orion. He drops the cubes in shock as they turn]
Starscream: No! Optimus Prime and Princess Twilight Sparkle!
[Starscream aims his missiles at the two who look on in shock]
[To be continued...]