Ellen to Star Trek Voyager

Ellen and Grace Under Fire crossed over in a cross over themed night

On a network crossover night, The Drew Carey Show, Grace Under Fire's Grace Kelly, Coach's Luther and Ellen's Paige and Spence all show up

Newhart's Larry, Darryl and Darryl squatted in Coach's Hayden and Christine's home

The Bob Newhart Show's Bob Hartley woke up after dreaming the entire series Newhart during Newhart's finale.

The Bob Newhart Show's Elliot Carlin visited the psych ward at St Elsewhere's St Eligius Hospital.

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

Both part of the Star Trek Universe