When Worlds Collide

Synopsis
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is at her house, telling her family about the adventure she had in the Digital World. Her family laughs at her, since she was gone in the morning and came back in the evening. Meanwhile, at Mikey's house, tells his mom about his adventure in the Digital World, and his mom doesn't believe it, but she says he could make good scenarios for novels, to his and 's disappointment. Suddenly, a blackout occurs, and Mikey runs out to investigate, with Shoutmon following him.

The two then find an aureoa borealis in Japan, and they realize a Digimon is headed this way. A voice then calls for Mikey, who tells him that he had guided him in the world to protect it. Mikey recognizes the voice as the one that gave him the Fusion Loader. The voice laments on how it is impossible now, and disappears before Mikey can ask where it is coming from.

The next day, Angie and Jeremy meet up with Mikey, and all of them say their parents think they were exaggerating, and no one can see Shoutmon except them. Shoutmon is disappointed, as he wanted to come to Mikey's world and that no one can see him and that he gets ignored. They then decide to hang out for the day, starting at eating at a restaurant, talking about how time must be different in the Real and Digital World. Afterwards, Mikey tells them he wants to go back to the Digital World to fight for it's freedom, and that he can't leave Nene and Christopher there.

As Mikey begins to doubt himself, the same voice contacts him again. Mikey begins to look downtown to find the voice, and ends up in the same alley where he got his X Loader and saved Shoutmon. Mikey looks behind a crate and finds a DigiMemory, and the DigiMemory releases itself. The Digimon inside then introduces himself to the kids as. Somewhere else in downtown, strange anomalies are happening, such as buildings being destroyed without anything being seen. is on a rampage at downtown Tokyo, growing larger everytime.

Back at the alley, Omegamon returns Shoutmon into his regular size and materializes him. Omegamon then tells the kids about his past, and that they had tried to prevent the Digital World from collapsing, but they failed to, and were turned into DigiMemories scattered all over the place. Omegamon ended up on Earth, and was looking for someone who can hear the DigiMelody of a Digimon. Mikey asks Omegamon to take him back to the Digital World. Omegamon warns Mikey that painstaking battles will await him if he goes back, but Mikey is ready for it, so Omegamon agrees to take him. Angie and Jeremy wish to go with him also, but Omegamon tells them that he can only send Mikey back with the rest of his power.

As they leave the alleyway, rumbling is heard. The three and Shoutmon run out to find Tactimon has also ended up in the Real World. Tactimon then notices them, so they start running away from him. As they run under an overpass, Tactimon takes the energy from the train and grows. Tactimon is amazed by the amount of digital energy that the human world has, as he never expected it to have much digital energy, and plans to tell about the human world. Tactimon then materializes himself with the power he gained from taking in the energy.

Shoutmon attempts to attack Tactimon, but is easily knocked away by him. Angie and Jeremy try to tell Shoutmon to stop attacking him because he is unable to DigiFuse. Mikey uses the Darkdramon DigiMemory to stop Tactimon, but Tactimon's newfound power easily destroys Darkdramon. The Omegamon DigiMemory falls down, and Angie and Jeremy grab it since if it is destroyed, Mikey will be unable to return to the Digital World.

Tactimon grabs Angie and Jeremy and tells Mikey to throw away his X Loader, otherwise he would kill the two. The Omegamon DigiMemory saves them, and Angie and Jeremy's energy is thrown into Mikey's X Loader. Shoutmon then begins to feel new power surging through him, and Omegamon tells him to evolve. Shoutmon evolves into OmegaShoutmon, surprising Tactimon. OmegaShoutmon easily tackles Tactimon, and Omegamon tells the kids that OmegaShoutmon is Shoutmon's future form. The battle continues, and Mikey's mom notices streaks in the air, thinking if it was the Digimon that Mikey was talking about earlier on.

Tactimon launches an attack at OmegaShoutmon, who dodges it, but destroys the nearby bridge. An enraged Tactimon then unleashes his sword to end the battle, which could destroy Tokyo if it hits. A notification appears in Mikey's X Loader, and Mikey asks OmegaShoutmon to use the ability. OmegaShoutmon uses it, and two fireballs are thrown at the unleashed sword. The fireballs stop the sword from hitting, and OmegaShoutmon uses the opening to deal the final blow on Tactimon. Tactimon is killed, with his sword being sent into the bottom of Tokyo Bay.

As the battle ends, OmegaShoutmon dedigivolves into Shoutmon and falls into the water. Back at the alleyway, Shoutmon is disappointed that his evolution ended. Omegamon tells Shoutmon that he can evolve back into OmegaShoutmon when he remembers the bonds shared with his friends. Omegamon creates a portal with his remaining energy and puts the Fusion Fighter's icon onto Mikey's shirt, who then leaves with Shoutmon. Omegamon then reverts to his DigiMemory form, and Jeremy picks up his DigiMemory, wishing Mikey the best of luck.

Meanwhile, in Bagramon's headquarters, DarkKnightmon asks if something is wrong. Yuu tells DarkKnightmon that Mikey has returned, and that he looks forward to battling him. -->

Digivolutions
(Number indicates order of occurrence.)

Quotes
Tactimon: "Damn you boy!"
 * —Tactimon enraged at Mikey for getting sent to the human world.