Who scored first goal in champions league?

The Champions League is the updated format of the former European Cup. The first Champions League was in the 1992/93 season and was won by Marseille. No club has ever retained the Champions League in its current format.

If however you mean the first European Cup which was in the 1955/56 season, that was won by Real Madrid, who would then go on to win it another 4 times in a row. Making them the only team in history to win 5 in a row. They have since won another 4 and hold the record with a total of 9.