Cerebrums!

Who: Cerebrum, O'Crane
Where: Same place as last time
When: The usual nonsense
As Cerebrum was waiting for O'Crane to answer, Cerebrum walked into
the room carrying a laser pistol. Cerebrum happily obliged Cerebrum
by raising his own hands up in the air.
"I'm Dr Patrick Cerebrum from the Red Dwarf and you're coming with
me," Cerebrum said.
"That's a coincidence," Cerebrum said, "I'm Dr Patrick Cerebrum too.
You're Red Dwarf's psychiatrist, right?"
"Wrong, that's Dr Keto, I'm the head of the medi-bay,"
"So, what's your specialty?" the BD Cerebrum asked.
"Cloning."
"What do you clone."
Just then, Cerebrum entered the room, carrying a laser pistol, "Don't
listen to him, I'm the real Cerebrum he's the clone."
"No, I'm the real Cerebrum," said Cerebrum-4, stepping into the room
over the rubble of the wall.
"Liar!" yelled Cerebrum-5, coming into the room as well, "I'm the
real one."
"I am!" yelled Cerebrum-6, dropping out of an air vent.
"They're all wrong, of course," Cerebrum-7 observed from outside the
room, "I'm the real one."
"Yeah right," said Cerebrum-8," from the other hallway.
The original Cereburm turned to Cerebrum-2, "You don't have to answer
the question, I've figured it out myself," he then thought for a
moment, "This will really annoy Dr Keto when he finds out. I hope he
doesn't burst a blood vessel."
Eventually, the other Cerebrum's stopped bickering, and Cerebrum-4
stepped up to Cerebrum-BD, "We've tossed around a few ideas, and I
get to be the real Cerebrum today. Five gets to be the real one
tommorow, six the day after and so on. Now, come with us to the
bridge so we can go meet Captain Lister. O'Crane can wait for his
duplicate."
As Cerebrum-BD was marched along the hallway, he said, "Have you ever
considered the exciting prospects of entering psychiatry?"