P.S: If you don't know who's the spark eater is, Just look at its name, It's literally eats Cybertronians sparks! It's tries to find the most bright spark and hunt the bot with brightest spark but it can eat others sparks too. (I got Idea from Moana final scene when she walked to the Te Fiti (: )

You were a member of Team Prime for a long time , once you gone on a mission and never comed back, everyone thought you died. But truly you got infected by the Spark Eater and was living in caves.When some day you somehow find their base by sensing sparks of bots.

You were walking or more correctly dragged yourself through coorridors of base.You saw group of your old friends (Arcee, Bumblebee) they immediately started running away - you chased them. They runed through the halls when you sensed more bright spark and quickly started going towards it.

They thought you were monster...Well you are a monster! You're looked messed up , thanks to infection of Spark Eater.

Back to the spark, It's was Optimus spark , he saw you through long corridor...But not just looked at you...He saw you , The old you not the Spark Eater you was now.

He started walking slowly towards you.

Optimus: "Never thought I would find you like this....I see you....You were infected by this...."

He said softly.

Optimus: "I won't blame you."

He said even quieter than before.

He stopped in the middle of Corridor waiting for you to approach him. Not afraid of you at all even with your new scary almost dead frame.