Appearing in "Descent (Part One)"
Featured Characters:
- Hazmat (Jenny Takeda)
- Chase Stein
- Nico Minoru
- Cammi Benally
- Death Locket (Becca Ryker)
- Anachronism (Aiden)
- Cullen Bloodstone
Supporting Characters:
- S.H.I.E.L.D.
- Dr. Ainsley (First appearance)
- Dr. Englezos (First appearance)
- Mavis Benally
Antagonists:
- Masters of Evil (Cameo)
- Baron Zemo (Helmut Zemo) (Cameo)
- Constrictor (Frank Schlichting) (Cameo)
- Madame Masque (Whitney Frost) (Cameo)
- Hellstrom (Daimon Hellstrom) (Cameo)
- Arcade (Appears on screen)
Other Characters:
- Runaways (Cameo)
- Molly Hayes (Cameo)
- Karolina Dean (Cameo)
- Victor Mancha (Cameo)
- Mettle (Ken Mack) (Appears on screen)
- X-23 (Laura Kinney) (Appears on screen)
- Reptil (Humberto Lopez) (Appears on screen)
- Juston Seyfert (Appears on screen)
- Darkhawk (Chris Powell) (Appears on screen)
- Red Raven (Dania) (Appears on screen)
- Apex (Katy Bashir) (Appears on screen)
- Kid Briton (Brian Braddock) (Appears on screen)
- Nara (Appears on screen)
Races and Species:
- Humans
- Glartrox
- Human-Demon Hybrids
- Mutants (Appears on screen)
- Human-Inhuman Hybrids (Appears on screen)
- Atlanteans (Appears on screen)
Locations:
- United States of America
- United Kingdom
- Brazil
- S.H.I.E.L.D. R&D Facility
- S.H.I.E.L.D. base Tesla (First appearance)
- Bagalia (Appears on screen)
Items:
- Fistigons
- Brimstone (Slugworth SLZ890 Shoulder Mount Plasma Cannon) (First appearance)
- Bloodgem Ring (Appears on screen)
Synopsis for "Descent (Part One)"
Three months have passed since the young heroes have escaped Arcade's latest Murderworld. And many will never be the same.
- Hazmat, suffering from post-traumatic stress disorder, has quit the Avengers and is now in hiding.
- Chase Stein and Nico Minoru now hate each other because Chase has become obsessed with putting up more info relating to the Avengers Arena online like Arcade did, as well as because Nico left the Runaways.
- Death Locket, whether anyone likes it or not, is once again being held prisoner by S.H.I.E.L.D., though she is able to escape through the help of a sympathetic agent who is helping her cope with her ever-evolving cybernetic implants as well as the traumatizing events of Murderworld.
- Cammi is back in Alaska, having discovered her mother had survive a previous attempt on her life by Cammi's space based enemies and struggling with her own PTSD by attending AA meetings with her mom.
In the present, Cammi reunites with Hazmat, Chase Stein, Nico Minoru, and Deathlocket after Anachronism summons them to England. Cullen Bloodstone has dropped out of the Braddock Academy, and he has become obsessed with killing Arcade, ultimately tracking him to Bagalia. Though this isn't all that bad, Anachronism then reveals that Cullen has formed an alliance with the Masters of Evil, who control the country. Baron Helmut Zemo is leading the Masters of Evil following the death of Max Fury and is assisted by Madame Masque (who works as Baron Helmut Zemo's right-hand woman) and Constrictor (who works as Baron Helmut Zemo's bodyguard). Additionally, Baron Helmut Zemo has also accepted Daimon Hellstrom into his inner circle of the Masters of Evil. Now these unfortunate heroes have to embark on a new mission: rescue Cullen before he becomes a true Master of Evil.