Crossword puzzle clue "first of a dead end trio"

First of a dead-end trio?

Trio + trio + duo

Familiarly, nutritious trio found twice in this puzzle—one trio is hidden in certain corners

"For Lycidas is dead, dead ___ his prime": Milton

Film with the classic line "Zed's dead, baby. Zed's dead."

Trail of Dead "___ of the Dead"

"I'm the beginning of eternity, the end of time and space, the beginning of the end, and the end of every place ..."

End of a loving trio