"The Creature, I think, is a great name for it," Dalton teases, without giving away exactly who - or what - he's playing now. "It seems it can inhabit bodies and convincingly portray whoever they're inhabiting.
"Is there Ward in there? What are his intentions? What does it mean for Malick? Is it human? Inhuman? Who is this creature?" Dalton says. "We're going to have to see what it's like when this creature is now not on Maveth anymore, but in fact back here."
See what else Dalton reveals about his new character in the video above.
Agents of S.H.I.E.L.D. returns Tuesday, March 8 at 8/7c on ABC.