As spring came, Luke knew that events were slowly beginning to set themselves into motion. He knew that the episode would bring back Sarah Jane Smith to the forefront of the Whoniverse and even set into motion her own point of view as a true protagonist. That meant that he'd need to keep an eye on her too along with the Torchwood team, yet that thought didn't faze him as much as he thought it would.
Despite how the shows are painted to be more family-friendly on television, Luke knew that reality was not as clear as portrayed. People lived their own lives outside of what is seen on screens or read in books, but even with all of his power, that fact cannot be changed easily.
Sarah Jane, outside of being with the Doctor to help guide her away from more dangerous events, will inevitably be put on the spot to decide what is dangerous and not. Even after reuniting with Ten and his new companions, she will encounter her own adopted son with an extremely high IQ and have to help him just like how the Doctor helped her. While Luke held his own hesitations about how the future will go in this wonderfully chaotic universe of his, he is broken out of his thoughts by a sudden ringing.
Before he could figure out where the ringing is coming from, his father (JJ) answers the phone.
"Hello, Stryker residence?" JJ greeted on the phone.
Luke couldn't tell what was being said on the phone completely, but the voices on the line seemed strangely familiar to him somehow.
"I'm sorry, but there seems to be some kind of strange glitch on this line," JJ remarked to the recipient on the phone apologetically. "What did you say again?"
"Strange glitch?" Luke thought to himself and to Michael. "Do you know what that means?"
"It's either someone from the future calling the current time," Michael responded cautiously, "or someone is attempting to call here from beyond the universe."
Luke took a moment to consider that. "Knowing this universe, I'm suspecting the former more than the latter. Wait, what do you mean about someone calling here from beyond the universe?"
"There are other universes besides this one in the grander cosmic board," Michael replied with a certain serious tone. "Much like how this universe iteration closely follows the events of the TV show and its spin-offs, there are other universes that your future self will inevitably interact in. This is evident by how the System gave you access to the Warhammer universe and a pre-generated modded Minecraft world."
Luke couldn't argue with that logic as it was true. He knew that the System would eventually give him a plethora of universes to adventure in and the [White Void] announcement had cemented the possibility of encountering other transmigrators. It was also this same logic that bred confusion in Luke's mind as he didn't know what this call his father answered meant yet.
"Could it be someone from my own future like River Song or someone else who was attempting to reach me across the universes like the Emperor?" Luke thought to himself. He looked at his father, whose eyes turned to look at his son for a moment, as his mind was attempting to put together the potential pieces of what's happening.
JJ told the other person on the line to wait a moment then lowered the phone to his chest before returning to look at Luke. "Hey bud, apparently the call is for you. Do you know this kid? Said his name was... Sora, I think?"
"What?" Luke looked shocked as the name struck a ton of bells in his memory. Without thinking too hard, he decided to walk over and talk to the person on the other line.
JJ told Sora on the other end that he's handing it over to him now and hands Luke the phone. Putting the phone up to his ear, Luke asked "Sora?"
"H-hey!" Sora's child-like voice, which to Luke sounded a mix of Japanese and English, said over the phone. Luke also noted that the line was, indeed, rather glitchy just like how his dad said earlier. "How are ya?"
"First of all," Luke began, but turned to look behind him first. He noticed that his father was no longer in earshot and his mother was at work, so he was safe for now. "Tell me, Sora. When are you calling me from?"
On the other side of the phone, it was Sora, Donald, Goofy, and Yen Sid that seemed confused about the question. While Sora didn't know how to answer the question, it was Yen Sid that seemed to figure it out somewhat.
"Time travel?" Yen Sid inquired.
"Time travel?" Sora then asked Yen Sid, more confused, but it was Luke that answered.
"Put me on speakerphone, Jiminy."
Jiminy Cricket, while overhearing the call, was shocked to realize Luke somehow knew he was there. He motioned for Sora to place the Gummi phone down on the desk and, when it was, he turned on speakerphone.
"You're on speaker, Luke," Jiminy motioned like a mini-gentleman.
"Thank you, Jiminy," Luke replied with a slightly happy tone. "Now then, to my question. I'm asking because you're clearly calling me with a phone and my current self on the phone hasn't yet met you. This tells me that my future self, at some point, gave you this number at a yet indeterminate time in your adventures and that, I presume, to call this number in case of a huge emergency that you cannot deal with alone."
Yen Sid nodded at that. "You're correct, Luke."
"Master Yen Sid, I presume?" Luke inquired as the voice seemed to be somewhat familiar to him too just like Sora.
"Yes," Yen Sid replied to Luke.
"So, the current time for you should be past dealing with Xemnas in Radiant Garden then," Luke pondered as he figured out that much thus far. "Sora and you wouldn't have met during that time as the only wizard they met in that point was Merlin in Traverse Town."
"Indeed," Yen Sid kindly replied as he also realized that this Luke was quickly figuring out when they are talking.
"Then I only have one question for you, Master Yen Sid," Luke said with a small shivering breath. "Mark of Mastery?"
"It is as you think, Luke," Yen Sid replied.
On their side, they hear a sharp intake of breath. "I see."
Back on Luke's side, he quickly realized that he is being called because Sora has lost his strength due to Xehanort's manipulations. This meant that his future self has already expected that outcome and they were trying to call his future self, but called his past self instead.
"So," Luke began after a moment of silence passed, "I'll give you this much advice. You have another friend who has lost and regained his strength before. No matter what strength you have now, there is nothing that prevents you from regaining what you lost."
"Oh! Herc!" Sora says out loud joyously as he remembers that with Luke's reminder. "Thanks, Luke!"
"No problem, Sora," Luke replied with a soft smile. "However, if I know my future self enough, if you need more help, I'll find you."
Luke quickly hangs up the phone before they all attempt to ask him for more information, but after a moment of processing what just happened, he realized what happened. Michael did too as he noticed what was happening alongside Luke and understood that the future is far more full of adventure than just what is connected to the Doctor.
Then, a System notification appeared.
==={+}===
[Qualifications acquired!]
[New Quest added: The Key to the Heart]
Due to a version of the Bootstrap Paradox, you have acquired the qualifications to traverse into the crisis points of the Kingdom Hearts universe. While direct travel is currently unavailable due to spatial-temporal distortions, the rewards for the canon event {School Reunion} has been altered.
You will now need to complete the canon event {School Reunion} in order to gain access to the Kingdom Hearts universe.
==={+}===
Continued in: School Reunion II.