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Although regulars are not credited when they do not appear, cast changes are only noticed when a character is killed or noticeably written out, like Niki, Monica and Micah after Powerless.

Main Cast

Genesis to Collision - Original Cast - 10

Hiros to Six Months Ago - DL added to cast - 11

Fallout to Parasite - Noah added to cast - 12

.07% - Simone removed - 11

Five Years Gone to How to Stop an Exploding Man - Isaac removed - 10

Four Months Later... - DL removed, Ando and Maya added - 11

Lizards - Adam added - 12

Kindred - Sylar added - 13

The Kindness of Strangers - Monica added - 14

Fight or Flight to Powerless - Elle added - 15

The Second Coming to The Eclipse, Part 2 - Adam, Elle, Micah, Monica, and Niki removed, Angela and Tracy added - 12

Our Father to An Invisible Thread - Maya removed - 11

Orientation to Strange Attractors - Nathan removed - 10

Once Upon a Time in Texas to ... - Samuel added - 11