"A Seeker Is Born": Minor; when Cherit suggests to Lok he check the inside cover, he does so, finding his dad's signature there - as well as two pictures of his family (Sandra and Cathy).
"The Legacy of Thor": Sophie mentions that her mom was presumed to have been a great art collector, and admits that when around such works, she's feels closest to her. Lok goes on to admit it's the same with his dad via puzzles, wishing he'd been in on things sooner- Sophie feels for him in that moment, and thus their bond starts.
"The Treasure of the Argonauts": It's a relatively small moment, but in context it's the biggest one between Dante and Zhalia, considering his trust in her is what ultimately drives Zhalia to change as a person, leaving the Organization to become part of the Huntik Team. And for added weight, it's later implied throughout the rest of the series that Dante knew/suspected her status from the very start, yet he still did so.
Zhalia: Hey, are you sure you want me to [take DeFoe's amulets to the nearest Foundation safe house]? I am the least trustworthy member of your team. Dante: (after a moment, sincerely) Despite what Sophie says, I know that at the end of the day, I can trust you. (walks away) Zhalia: (letting out a breath, truly affected) No one's ever said that to me before...
"Home Turf": When seeing Scarlet's friendly flirting with Lok and Dante, Sophie and Zhalia, respectively, are subtly jealous of what's happening. In Lok's defense, he says to Sophie that, well she doesn't have to be jealous of Scarlet before words fail him - before the Organization interrupted them, Sophie was looking forward to what else he had to say. And during that interruption, Lok trusts Sophie to come up with a plan, pushing her to safety while denying himself that chance.
On Zhalia's end, she's having 'trouble', but she ultimately can't bring herself to what she's supposed to do, because she remembers Dante's trust in her.
"The Spectre Deception": Zhalia finds that she and Lok are Not So Different, and it later compels her to save his burning backpack (containing a puzzle from his father), when otherwise she mightn't have bothered.
Lok: I know you're a really good person, no matter how you act. I couldn't have made it this far without you. Finding my dad isn't just a fantasy; it's the reason I became a Seeker at all. You must've had a reason too, right? Zhalia: The reason is that I wanted the power to take care of myself. You see I was born on the streets; I had nothing, not even that. But someone helped me, not making it easy, but he gave me a chance... and I took it. Lok: Just like Dante and Sophie, for me. After all they helped me through, I'd do anything for them. Zhalia: That's right. For the one who finally gave you a chance, you'd do anything. Yes, anything...
"Ladies Choice": The treasure Metz's key unlocks? Keepsakes of his wife, the mother of the Amazon's current queen, who he still loves to this day.
Having come back, and proven herself by throwing Behemoth to Dante, Zhalia offers herself to be turned in, citing what she's done as examples. Metz agrees with that, saying they can't have a known spy on the loose, so instead they'll make her an official Foundation operative - this realization is almost too much for Zhalia, though Dante's support is appreciated.
"Unseen Guide": The first place Zhalia runs to after faking her death is Dante's house - he immediately gives her a spare coat and coffee, as well as a hug and words of comfort. There's even an Almost Kiss before Lok interrupts.
During the following mission briefing, Dante makes a joke, winks at Zhalia, and she giggles in response - she's as surprised as everyone else by this.
Latter, when it seems Lok's in trouble, Sophie is a little frantic about trying to get to him - and once he's back unharmed, she's already rushed forward to lean against him before realizing this, quickly backing away out of embarrassment. Despite this, it's clear that neither really minded her moment.
"To Be Together": The rescue moment from the falling rocks, and the ensuing blush on both Lok and Sophie, plus awkwardness. Not to mention, Lok's attempted confession to Sophie, following her's in Atlantis.
When trying to unlock the door to the Legendary Titan of Soul, Lok sheepishly says he knows what to do. Sophie has this big smile on her face like she knows what he's planning. Cue Love Confession, reciprocation, and the door opening.
When Lok suffers Heroic R.R.O.D. from invoking the Titan, Sophie is the first to run to him, and unflinching catches him despite his weight pulling her down to the floor.
"The Mission": Zhalia refuses to leave Dante alone, as he's the most important thing in the world to her.
On a smaller note, Cherit's hurry to catch Lok despite the latter being far above his normal weight capacity, and Lok-via-Kipperin catching Sophie in the nick of time.
By the end, the team walks out of the Professor's castle, weary but supporting each other, particularly the two couples - Lok and Sophie are holding hands + leaning on each other, while Zhalia has Dante's trenchcoat wrapped around her shoulders.
"Doorway To Huntik": Even if through an image, Lok finally gets to see his father again! In hindsight though, you realize this and all other appearances - save one, where the Holotome was dead - were really Demigorgan, overturning this.
"Cave of the Casterwills": Two episodes ago, Sophie was told she is a true descendant of the original Casterwill, but here she receives true proof of that - going by her reaction, she's absolutely ecstatic, at a level of emotion only matched by Lok's previous love confession.
Then during her test, Sophie finds that Sabriel never really left; her bond brought her back, amulet part of her body now, and fully Powerbonded as a result.