Curate, connect, and discover
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.
Having the brain/memories of a genius comes as a gift. However, Danny still doesn't realize that he's overshadowing someone and goes out to do some recon of his own.
He wants to see if there's really a Batcave in Wayne's basement.
"Oh my god." The kid muttered, pacing back and forth in front of the summoning circle anxiously as he clutched some old book to his chest, "Oh my god, I just killed Nightwing."
"Uh," Nightwind started to speak, but didn't get far.
"Oh my god, my dad is Nightwing!"
"Wait, what?!"
That seemed to catch the boys attention and...yeah the kid looked a lot like he did as a teen. "I, uh" The kid rubbed the back of his neck nervously, "I'm kinda your clone. My parents made me and told me recently about how I was born and I wanted to meet you!"
He threw his hands up in the air, one hand still clasping the book, "They told me you were dead, so I tried to summon your ghost! I swear I didn't know!" This seemed to switch him back into whatever spiral ge was in before, "Oh god, I killed my own father."
Dick hurried to speak before he lost the chance again, "I'm probably still alive."
"Huh?" The kid looked over at him, a hint of hope in his features
"Yeah," Nightwing shrugged, "some other bats were with me. They're trained to keep my vitals up until they can get me back to the cave. Plus, I felt my soul pulled out of my body by force. I don't think you actually stopped anything from functioning."
The kid sagged with relief, "So batman isn't going to murder me?"
An odd sound came from within the summoning circle as Nightwing covered his mouth
"Are you laughing at me?! I'm being serious!"
This time, the vigilante made no move to hide his laughter, "We don't kill kiddo, besides he probably won't maul his own grandkid, right?"
Unfortunately this gave the kid something new to spiral over, "Oh god, my grandpa is Batman."
"How about we start over?" The bluebird asked, "I'm Nightwing, what's your name?"
"Um, Danny. Danny Fenton."
Dick gave an award winning smile, "Nice to meet you, Danny. Could you break the circle so I can get out?"