I had a comment on my Off the Record fanfic saying "Couldn't Batman just use his Bat-nesia gas on Chief O'Hara" (by Reader)
My response: no because it gives me an excuse to write a sequel :D. And Batman hasn't invented it yet.
So here it is. I recommend you do read Off the Record first or this might be a bit confusing.

Around a year after the events of Off the Record…

It had been another successful day of catching villains for Batman and Robin. They were in the Commissioner's office telling him that they had caught the Penguin and he was now back in the penitentiary where he belonged. As Batman and the Commissioner were talking, Robin was waiting patiently and the Chief was glancing back and forth between the Commissioner and Robin.

"Well Commissioner, we best be going" Batman said.

"Ah yes of course. Me and the Chief should get ready, we have been invited to dinner at Wayne Manor by Bruce Wayne" the Commissioner stated getting up from his desk.

Batman had almost forgot that it was tonight that he had invite them over. He and Robin said their goodbyes and rushed off, back down to the Batmobile and off home. When they got back and up into the study, they could already smell the delicious food Alfred was preparing. Bruce wondered into the kitchen to see how things were going while Dick went into the living room where Aunt Harriet was, reading a book. Bruce joined them a few minutes later and started up a conversation with them about birds and trees. Not long after the conversation started, the doorbell rang. It was the Commissioner and the Chief. Bruce greeted them along with Aunt Harriet and Dick.

Dinner was a delight. They all had moved from the dining room to the living room to continue socialising. Bruce was talking about his latest Wayne Foundation investment. Dick was trying to look interested but in reality, he was tired. The Penguin had given him and Batman the run around earlier today and he just wanted to go to his room and relax. He could feel a headache coming on but he didn't want to be rude and interrupt Bruce when he was on a roll, so he sat quietly and pretended to listen. Alfred walked in with a tray of drinks and he couldn't help noticing how tired Dick looked. Alfred placed the tray down on the table.

"Are you alright, master Dick?" He questioned the youngster, which caused Bruce to look over at his ward and he too could see that Dick wasn't himself.

Dick stayed silent in slight embarrassment at Alfred singling him out in front of guest. "Dick?" Bruce raised an eyebrow at him. Dick looked at Bruce and said "I'm just a little tired, that's all."

"It is about time we left; don't you think so Chief?" The Commissioner piped up. The Chief agreed and they were escorted out by Alfred and Bruce. Bruce thanked them for coming. Chief O'Hara glanced back at Dick who was rubbing his forehead, knowing exactly why the boy was tired. Running after Penguin would tire anyone out and give him a headache. The two men left the Wayne residence. Alfred disappeared back into the kitchen while Bruce went back over to Dick. Aunt Harriet suggested that Dick should have a nice warm glass of milk, so she hurried off to get one. Bruce sat down next to his ward.

"Headache?" He said plainly.

Dick nodded slowly, struggling to keep his eyes open. Aunt Harriet returned and Dick drank his glass of milk before making his way upstairs to his room for some much-needed rest. Bruce wished him a goodnight before heading to his own room, he too needed some shuteye.

In the morning, Dick was feeling much better and well rested but there was no time for breakfast. Commissioner Gordon had called in a panic saying that King Tut had infiltrated his office and turned it into his palace. Batman and Robin raced to headquarters where they met Gordon and O'Hara outside the barricaded office.

"Thank you for getting here so quickly Batman. As you can see, I've been thrown out of my own office" Gordon exclaimed just as the laugh of King Tut could be heard coming from inside the office.

"Don't worry, Commissioner. We'll get you back where you belong, behind that desk of yours" Batman said confidently. Before Batman could do anything, the office door opened to reveal King Tut holding the phone.

"It's for you" He said, handing it over to the Commissioner. Gordon took the phone cautiously and answered it.

"Hello?"
"Yes, hello Warden Crichton"
"No that was King Tut"
"Yes I know that. What is it you wanted?"
"What!? That's all we need"
"Yes. Thank you"

Gordon hung up the phone looking even more miserable than before. King Tut snatched the phone back and retreated back into the office. Batman reacted quickly and didn't give King Tut enough time to lock the doors. He and Robin burst in and began to fight the 4 henchmen that were in there. After a few minutes, all 4 henchmen were out cold and King Tut was being led away by Chief O'Hara and his men.

"Well at least he's gone now, back to the Pen" the Chief proclaimed.

Gordon sat in his chair and sighed.

"What's wrong, Commissioner?" Robin inquired.

"The Joker has just escaped"

Robin and the Chief gasped simultaneously. The Joker had been in the Pen for almost a year for kidnapping and torturing Robin and O'Hara.

"Any ideas on his whereabouts, Commissioner?" Batman said sternly.

"No Batman, unfortunately not. Chief, you and Robin must be careful" Gordon voiced his concern.

"Don't worry, Commissioner, we'll find him before he can do anything" Batman reassured him "Right, Robin. Let's go and see if we can track him down"

Robin nodded and followed Batman out of the office. Chief O'Hara watched them leave with worry building up inside him. The Commissioner noticed the worried expression on the Chief's face which made him more concerned than he already was.