In the past, Megatron destroyed Orion Pax and Ariel, and the other Decepticons destroyed Dion. Alpha Trion managed to rebuild Orion Pax and Ariel into Optimus Prime and Elita 1, but Dion's fate is not revealed. Some fans speculate that Alpha Trion fixed him too, rebuilding him into either Ironhide or Ultra Magnus, but that speculation was never verified.
Alpha Trion looks and sounds much younger than in The Search for Alpha Trion (1985) and The Key to Vector Sigma: Part 1 (1985). He is the only Transformer who aged in the series.
In David Wise's original script, Orion Pax's demise was apparently more violent and graphical. With Megatron blowing his arm off and then using it to decapitate his head and then severe his remaining limbs with it. Understandably the studio asked that he change this.
When finally asked in 2010 what became of Dion, Hasbro stated that Dion and all the other Autobot dock coworkers were all slain in the Descepticon raid. This was to show the seriousness of the war with actual casualties. Ariel herself was intended as a casualty, but after somebody noticed the similarities between her and Elita-1, changes to the script were made.