Evidence for the Pairing

Episode 1:
When Caleb is being sucked through a portal, Will tries to save him, but when she is unsuccessful, she looks worried about what happened to the mysterious stranger.

Episode 2:
When Caleb is in the dungeon trying to escape, Will is dropped in and lands in his arms.
Blunk scares Will, and she grabs Caleb.
Caleb runs off to hold off the enemy, while Will flies after him and says, "No! You don't have enough power!" *Sparkly music begins to play* "Guarding the veil is more important than one rebel fighter. Oh, by the way," *Close-up on Will's face* "I'm Caleb."
When out of the castle, Will looks back and says, "I'm going back for Caleb."

Episode 3:
While Caleb is talking to Aldarn, Will runs into them and lands right on top of Caleb.
Caleb and the guardians sneak into the castle. Caleb complains that they're tagging along. "Hey! We are not tagging along, Mister 'brave hero'!" Caleb tells her to hush. Ooh! The tension!!
Two guards are about to attack Will, but Caleb steps in, knocks them out, and grins at her.

Episode 4:
Caleb paces back and forth, and says to Blunk, "I've got to get Will something for her birthday! In Meridian, I'd give her the custumary chicken-skin hat! Well, Earth girls do like the stuff that smells in tiny bottles."
Caleb gives Will her present, a beautiful picture of her in her Guardian form. He stands next to her, grinning as she tells him he's so talented. He tells Will that the carving is from driftwood, and the wings are made from dragon scales. (Now, how could he have made such a beautiful picture of Will without having observed her closely? And why would he spend so much time and effort making a gift for her? Hmm, hmm.)
Will and Caleb double-team and throw a bench on the charging Cedric. Cedric knocks them to the ground and attacks again, so Caleb grabs Will's hand and pulls her to safety.

Episode 5:
After Will fainted, Caleb stands by, watching in concern.

Episode 6:
When looking for a book in Cedric's bookshop, Will trys to touch a book and is blasted backwards by a gust of wind. Caleb comes up behind her and puts his arms around her, asking her if she's all right.
Caleb and Will run into Phobos. Will gasps and grabs Caleb's hand, telling him to get back.
Phobos zaps Caleb, sending him to the ground. Will rushes over to a bookcase and desperately tries to topple it on Phobos.

Episode 7:
Caleb and Will sit next to each other in Hay Lin's basement, and Caleb says, holding a pair of old skis, "These would make fine longbows," making Will laugh.
Will tells Irma not to be too hard on Caleb because he doesn't have fun in his world. "I know what fun is!" Caleb protests.
Yan Lin pulls up at the ski lodge. Caleb smirks at Will and says, "I'm no fun, am I? Well tell that to my skis!"

Episode 8:
Caleb is trapped in a rock, Will pulls him out, and is holding him upright as they battle.

Episode 11:
Caleb asks Will to toss him one of the shovels.

Episode 13:
Will and Caleb go off together to corner the Meridian-hog-thing at Sheffield Institute.

Episode 14:
Caleb runs up to Will and puts his hand on her shoulder, telling her that Lord Cedric is there with Elyon.

Episode 16:
While using his parachute, Caleb fumbles with it and mumbles, "Will said there was a cord!"

Episode 21:
Will holds Caleb and flies him up a chasm.

Episode 22:
Will and Caleb stand together and watch the sunset as they discuss Aldarn's brainwashing.

Episode 23:
Will and Caleb split off from the others and spy on Phobos' castle. Caleb holds up a hand to shush Will when she starts talking, because he hears something.

Episode 24:
While Will is walking with Matt, Caleb runs up to her and puts his hands on her shoulders, telling her he needs her help right away.

Episode 25:
Caleb walks Will home in the snow. He asks her, a bit shyly, if she likes Matt. He comments in obvious annoyance that he thinks Matt is following them.

Episode 32:
Will says that Caleb needs a pair of ice skates and leads him away by the arm, smiling.

Episode 34:
While Will fights her alter-mirror, Caleb dives and grabs her, thinking she is the alter mirror. Will cries, "No, Caleb, it's me!" Caleb replies, "Whoops! Sorry, Will!" and lets go. Then, the other Will shouts, "No, Caleb! I'm me!" He shrugs. "As if girls aren't hard enough to figure out when there's just one of them!"
When Will's alter-mirror tries to take her down with an electrical attack, Caleb kicks a soccer ball in the way, protecting Will.
As Will holds a fading alter-mirror in her arms, Caleb sits next to her in concern.

Episode 51:
Will and Caleb go together to free Phobos from his cell.