"You are so going to freak!" Clark wasn't quite sure that this was good, since Wally looked just a bit too excited. "You will absolutely freak."
"What's happening?" If Batman had gone in and somehow gotten Lex out by himself, he'd kill him. But gratefully.
"There's a new member in the League." Okay, not Lex. Batman could go on living. "Guess where he's from."
"My home planet?" That'd mean answers. Finally, answers.
"Well, close. Not in a geographical way, because it's about as many million miles away, but you're on the right track."
Maybe he'd kill Wally, instead. "So it's another planet, right, but not where I'm from."
"Yeah, buddy, you aren't the only alien on the planet." Oh. Well. Oh. That was good. He guessed it was good.
"So what planet's he from, anyway?"
"Mars. That is so cool!"
Mars. Practically neighbors, then. Not nearly as exciting as being from out of the solar system, which was what Batman and Lex had figured out about him. Lionel had probably figured it out, too, but never told him. "Yeah. Mars. That's cool."
They'd slowed down to talk and Wally was grinning his head off as he opened the door. There was actually a green guy sitting in one of the chairs, talking to Bruce. "There were three of our kind, you see, whites, reds, and greens."
Bruce looked up. "There you are, Clark. J'onn, I'd like you to meet Clark Kent. Clark, this is J'onn Jonz. He's originally from Mars."
"Hi." The guy was tall, green, and bald. Lex would probably think that was cool.
"Hello, Clark, it's a pleasure to meet you. Bruce told me quite a bit about you." Uh oh. That might not be all good, since Bats definitely knew all about grudges, and Clark hadn't really apologized for a lot of his better inspirations. But then J'onn was smiling, which Clark took as a friendly expression.
"Uh, great. Wally told me that you're from Mars and that you've joined the League?"
"Batman and Wonder Women have kindly invited me, yes. I'm very much looking forward to learning more about you and working with you, especially since we seem to have some rather similar abilities."
When it came to abilities, Clark was on his home ground. "Yeah. I'm fast, almost as fast as Wally, and I'm strong. We've never gotten to testing exactly how strong, because at about eight tons, there's a limit to things to pick up, you know?" That'd impress him.
"Very interesting. I'm probably not as fast as you, but since I can shape-shift, I'm able to be quite strong as well." Shapeshift. Wow, that'd be so cool. First thing he'd do would- "I'm also telepathic and can read minds and link them. I can also locate people through a psychic link. Bruce and I were discussing how that might be of use to the League." That definitely sounded useful. J'onn opened his mouth again. Sheesh, how many abilities did the guy have? "I can also use my eyes as a kind of laser."
"I've got something like that. Watch this!" Clark turned to the fireplace, which Alfred must have laid recently, and ignited it with a quick, hot burst. He turned back triumphantly to see J'onn's reaction.
The Martian was writhing on the floor, screaming. Bruce shouted, "Put it out, now!" This was making no sense at all, but Clark blew the fire out.
"What's going on with him?"
Bruce looked at him levelly. "His one weakness, Clark, is fire. He's pathologically afraid of it."
Nobody ever told him anything, or at least not in time.
AN: Yes, yes, it totally screws up canon chronology, but I'm having fun. I wanted them to meet when Clark would still be a bit immature about it but not so early that J'onn could help rebuild Gotham.