- Howling Commandos (First appearance chronologically)
- The Leader (Samuel Sterns)
- Vlad Dracula (First appearance chronologically)
- Lord Hulk (Bruce Banner)
- Vampire Jameson
- Dr. Frankenstein (Mentioned)
- Dracula's Train
Hulk follows Leader back in time to the Victorian era and unites the Howling Commandos against Dracula who wants to shroud the Earth with Leader's gamma cloud allowing vampires to prey night and day. In the present, the Agents of S.M.A.S.H. deal with a Vampire Hulk.
- This episode aired on Watch Disney XD on May 18, 2015.
- This episode's title is a reference to Days of Future Past storyline.