Danny Phantom (2004)

S2E16 Double Cross My Heart

Sam has developed a crush on Gregor, a mysterious goth transfer student from Europe. Meanwhile, Danny feels a pang of jealousy but refuses to acknowledge it. Instead, he starts to believe that Gregor might be a covert agent for the Guys in White, intent on capturing Danny Phantom. When Sam discovers Danny has been watching her, she's outraged. However, Danny's paranoia escalates when the Guys in White arrive in Amity Park. As Tucker steps in to help Danny investigate Gregor's true motives, the question remains: is Sam in peril, or is Danny simply insecure about her budding relationship with Gregor?