Marvel's Agents of SHIELD provided a surprise treat to fans attending WonderCon 2016: an early viewing of Tuesday's episode, "Watchdogs." The episode features the arrival of Mack's brother Ruben Mackenzie (Gaius Charles), the villainous anti-Inhuman group Watchdogs and plenty of Easter eggs to other parts of the Marvel Cinematic Universe.

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Of diving more into the backstory of Mack, Henry Simmons told the WonderCon audience, "It was also fun coming off the episode where we said goodbye to Bobbi and Hunter." Yes, there will be some emotional fallout to that Marvel's Most Wanted set up If you want to go into "Watchdogs" completely spoiler-free, best to avoid the eight teases below, but if you're game to get excited for Tuesday's episode, read on!

1. There's a Clear Daredevil Crossover Moment

2. There Will Be Fallout to Bobbi and Mack's Departure

3. Mack's Secret Nickname Is Totally Adorable

Gaius Charles as Ruben Mackenzie on Marvel's Agents of SHIELD

4. Jemma Simmons Takes Her Wellbeing Into her Own Hands

5. Becoming a SHIELD Agents is Difficult Business for Lincoln

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6. Daisy and Fitz Make a Great Team

Elizabeth Henstridge as Jemma Simmons on Marvel's Agents of SHIELD

7. A Familiar Face Returns Who We Haven't Seen Since Season 1

8. Mack Has... a Butcher's Cleaver?

It is small and easy to miss, but Marvel is taking full advantage of Daredevil's launch on Netflix with a clear Easter egg tied into the events of Season 2. Let's just say that the gang wars breaking out in Hell's Kitchen are enough to make the news. And this isn't the only larger MCU reference in the episode: the Avengers and molecular nitroamine both get shoutouts.The episode opens with Mack on vacation after Bobbi and Hunter's exit from the show. He's still dealing with the emotional fallout of that, disappointed that his two closest friends at SHIELD left for good -- among other issues he's been having with the organization.Henry Simmons' character's full name is Alphonso Mackenzie, but he prefers to go by Mack. Turns out, that's not the nickname his mother prefers -- she's the only one who is allowed to call him "Alfie."As Elizabeth Henstridge previously teased , Simmons tackles her guilt over her role in Lash's murder of other Inhumans by taking her training into her own hands. But when May finds out that she is tackling that in a gun range, she puts Simmons' talents to better use.Lincoln is in the final stages of becoming an official SHIELD agent, but he has one last person to convince: Coulson. The director of SHIELD isn't convinced of Lincoln's commitment to the team, and he's playing hardball.The various SHIELD pairings get switched up a bit when Daisy taps Fitz to be her second on a mission close to her heart. While Fitz often doesn't spend as much time in the field as she does, he turns out to be a great partner to have at her back.Mums the word on who the character is, but he's someone who hasn't been seen since the first season of the show, and his take on the world has changed a lot since then. The creation of Ultron? The proliferation of Inhumans? This familiar face hasn't taken kindly to the evolution of powered people, and is now more enemy than friend.And trust us, it gets even cooler than Mack having an axe. That man knows how to make use of his sharp, pointed objects.

Marvel's Agents of SHIELD airs Tuesdays at 9 p.m. ET/PT on ABC.Terri Schwartz is Entertainment Editor at IGN. Talk to her on Twitter at @Terri_Schwartz