Kids of Degrassi St to Star Trek Deep Space Nine

Degrassi Junior High was reworked and repurposed from The Kids of Degrassi Street.

St Elsewhere's Dr Wesphall is paged twice on Degrassi Junior High. In the episode "Nothing to Fear" LD's father is in the hospital and Dr. Westphall is paged on the hospital intercom. Later, in the episode "Sealed with a Kiss", "Dr Donald Westphall" is paged, loud and clear, over the hospital intercom when Heather & Erica go in for a mono test.

St Elsewhere's Westphall, Craig and Auschlander visited Cheers' bar

Cheers spun-off Frasier

John Larroquette Show's John Hemingway called into Fraiser's show

THe John Larroquette Show reference Yoyodyne which is the company that makes some of the starships mentione on Star Trek: TNG

Both part of the Star Trek Universe