Conversation so far:
When did season 4 come out?
The 1970-71 season brought new additions to the cast include tall, lanky.
Who were the cast?
the cast include tall, lanky, sad-eyed Dennis Allen, who alternately played quietly zany characters and straight man for anybody's jokes; comic actress.

Question: What happen in Season 5?
Self-contained rewrite: What happen in Season 5 of Rowan & Martin's Laugh-In?