Spawn
Tim went mad scientist during the search for Batman and he cloned himself just in case he died. The objective was to retain all knowledge even if the original was dead, so he wore a chip that would feed knowledge to the clone that was in stasis.
All of this was a contingency for Ra's interest and the LOA's meddling. However, it so happened that Phantom was launched across universes and he landed by complete coincidence inside the gestating clone. The overshadowing was so shocking that it put Phantom to sleep for a couple of weeks. When he woke up, the pod sprang open and Danny fell down to the ground face first. Turns out Tim's heart flatlined for a couple of seconds while he was trapped with the LOA, and that was enough for the clone to be released and the chip connection to be cut.
Now Danny, naked and completely bewildered, is having contrasting information in his head about himself. He's Danny Fenton, half-ghost screw up, and he is at the same time Tim Drake, genius superhero that just died at the hands of Ra's. He has to investigate how to go back to his own world and he has to look into Bruce's disappearance to bring him back.
The whole thing is a literal headache, and Danny settles for using the gadgets and clothes Tim had left for him.
At least he knew that Tim Drake had left him a mission.
