Conversation so far:
Who were the Kangaroos for Al Costello?
Costello was the creator and original member of the tag team The Fabulous Kangaroos
What did Al Costello have to do with The Fabulous Kangaroos?
Costello was the creator and original member of the tag team The Fabulous Kangaroos
How did The Fabulous Kangaroos with Al Costello perform?
Costello and Heffernan are arguably the most famous version of The Kangaroos, regarded as one of the top tag teams to ever compete in professional wrestling

Question: How did things unfold after the promotion?
Self-contained rewrite: How did things unfold for Al Costello and The Fabulous Kangaroos after the Stu Hart's Stampede Wrestling promotion debut?