Christopher "Chris" Thorndyke

At the end of the Homebound Saga, Chris does the unthinkable and hits the shut off switch to the portal which leads to Sonic's world before the latter could enter, shutting it down to everyone's shock. Before anyone could ask Chris why, he grabbs Sonic and flees for parts unknown. Despite being willing to see everyone else off, Chris refused to let Sonic leave as he felt that, due to his parents and their busy schedules, Sonic's departure would leave Chris feeling all alone again. Fleeing to his family's old lakeside retreat, Chris and Sonic were able to talk, and Sonic finally convinced Chris to let him return to his world. It was then revealed that though Chris had shut down the portal, Sonic had always been able to use Chaos Control with the Chaos Emeralds to return home under his own power. Shortly after Sonic departed, Lindsey and Nelson, who finally understood Chris' feelings and wanted to make up for their absence by spending more time with him, arrived to find Chris waiting for them. Six years later, at the age of eighteen, Chris has grown considerably. In that time, he and Helen began working together on getting the portal working again to visit Sonic in his world. Eventually, they took a break to go meet with Frances and Danny. As the four friends discussed things regarding events with Sonic and the others so long ago, Chris reminisced about his time with Sonic and all the adventures that they had together. Early in the third season, he gets the portal working and uses it to travel to Sonic's home in the show. But due to the differences in time acceleration between both planets, the teleportation process rejuvenates his body back to his pre-teen age. Chris no longer takes the back seat in the X-Tornado; instead, he is shown as flying it capably, which his younger self would never have been able to do so. Chris also comments in one episode that he is a black belt in karate. Additionally, he has also shown to have become a quite capable engineer, enough to impress Tails. He invents different gadgets and devices like Sonic's Hovershoes, a hoverboard, and a new, better Chaos Emerald scanner for the Blue Typhoon. He is also seen in a few episodes using Flash Bombs as a distraction, and he also uses a laser gun as a weapon. His support allows Sonic and their friends to defeat the Metarex in numerous conflicts, culminating in the final battle against Metarex leader Dark Oak, which results in the destruction of him, his remaining Metarex forces, and tragically, Cosmo, who sacrificed herself to paralyze Dark Oak so Tails could deliver the killing blow to Dark Oak with Super Sonic and Super Shadow using the Sonic Power Cannon. However, with the Master Emerald having been sacrificed to kill Dark Oak's two remaining generals that fused with him into Final Mova, Chris was stranded in Sonic's world until Eggman offered a means to allow Chris to return home. There was a catch though: Chris could not take the time to say goodbye to Sonic and his friends as the window for him to return home closed in a few minutes. With little option left, Chris took Eggman up on his offer, boarded the pod, and was launched to return home. As he roared into the sky, Chris spotted Sonic running along the ground below, who looked up and wished Chris good luck before the pod disappeared from view as Chris returned home to Station Square and Earth. As a result, since Chris never got to say goodbye to them, Sonic and his friends all declare war on Eggman.