In "Scary-oke," Agent Trigger and his partner Agent Powers both arrive at the Mystery Shack to investigate mysterious activity in Gravity Falls, and begin an inspection of the shack's gift shop. During their visit, Powers discloses to Dipper their ongoing investigation of a paranormal case that he suspects is deeply rooted within the town, which entices Dipper to help with their research. Powers gives him a business card that Stan quickly confiscates, hurriedly convincing the agents that the paranormal aspects of the town are mere legends to drum up business.
Later that night, Dipper manages to steal the card from Stan, arranging to meet Powers and Trigger in the woods where he reveals to them Journal 3. Unimpressed, the two prepare to leave, but quickly change their minds when a zombie that Dipper has raised with the journal attacks them; they kill the undead enemy, only for hundreds more to rise up from more fissures in the earth, and eventually drag the two agents out of sight. During the end credits, the battered agents emerge, having survived the offscreen encounter, and Powers concludes that they need to "bring in the big guns," despite Trigger objecting that the government won't believe the supernatural events they've witnessed.
In "Northwest Mansion Mystery," he and Powers are seen in disguise. Trigger was dressed as a woman at the Northwests' party, where they go into the closet to talk about the reading they got from McGucket.
In "Not What He Seems," he assists in arresting Stan Pines, and attempts to escort the twins to child services, but they cause an accident and leave him stuck in the wreckage. As they walk away, he warns them that Stan has been keeping secrets from them and is guilty of the crimes he was accused of. The twins refuse to believe this and head off to prove Stan's innocence, while Trigger angrily swears that they will regret it.
In "A Tale of Two Stans," Trigger, alongside Powers and some federal agents, arrive at the destroyed Mystery Shack to resume the investigation just as Stan finishes telling his and Ford's backstory. However, just before they can go in and find out about the lab, a modified blast from the memory erasing gun causes him and the rest of the agents to lose their memory of the events, and be driven off the case by Ford.
Agent Trigger appears to be several years younger than Agent Powers, and is distinguished by his close-cropped, light brown hair. Like his partner, Trigger wears a plain black suit over a white shirt and plain black tie, with an American flag-shaped pin in the suit's lapel.
- 201. "Scary-oke"
- 204. "Sock Opera" (no lines)
- 205. "Soos and the Real Girl" (no lines)
- 206. "Little Gift Shop of Horrors" (no lines)
- 207. "Society of the Blind Eye" (no lines)
- 209. "The Love God" (no lines)
- 210. "Northwest Mansion Mystery"
- 211. "Not What He Seems"
- 212. "A Tale of Two Stans"
"Is it coming from deep space? An enemy weapons site?"
"I'm confiscating this for evidence."
"That was insane! I've never seen anything like it! Who do we report to?"
"Why do we always have to fight at parties?!"
"Wha— Hey! Not in front of the special ops guys!"
- Agent Powers and Agent Trigger's names are a play on the term "power trigger."
- Trigger tends to repeat whatever Powers says.
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