does anybody know what the highest rated episode in the history of the series was? what season was it in also?

i dont know about that, but on TVTome, the highest user-rated episode is "A Stash from the Past" followed by "Wait Till Your Father Gets Home"

The lisbian kiss episode did a 28 rating in the 6th season, but the first season overall had a 25 rating, so I would imagine that the highest rated episode would be in that season.