Second Megan Period, or Megan's Mound Period, is one of the periods of the xkcd comic Time within the Castleiferous Era.
It lasted from frame 234 to 324. Between frame 255 and frame 256 three "apocryphal" frames were shown . These are not included in the canonical numbering and are referred to here as 255a, 255b and 255c.
Megan and Cueball re-enter; Megan goes to the middle, and Cueball remains at the left edge. Cueball fixes up the damage from the mis-fire of the Trebuchet a few frames ago, then leaves. Meanwhile, Megan creates a mound where the trebuchet had fired. She sleeps on it, then piles more soil on it from behind. Cueball re-enters, and helps Megan with the mound, squaring it off. A text panel occurs, and they discuss the river. The period ends as Megan leaves.