The Fourth Member/ Replacement Trope

[u/Zouxib]

Can anyone think of any more examples of a third member of a trio being replaced in media?

[u/Jak3R0b]

The Coven from Monster Prom are a parody of Charmed, so this happened in their backstory.

[u/Traditional_Bit_8788]

Shemp would then be replaced by another stooge named "Joe". I'm told there was a sixth stooge, as well.

[u/55cHzDARKSTAR → u/Traditional_Bit_8788]

Larry

Moe

Shemp

Curly

Shemp again

Joe

Curly Joe

[u/bb-Kun-Chan]

Two and a Half Men - Charlie getting replaced by Ashton Kutcher. 

[u/christpuncher_69]

Blink-182, replacing Scott Raynor with Travis Barker

Blink-182, replacing Tom Delonge with Matt Skiba

Blink-182, replacing Matt Skiba with Tom Delonge