Here is the thing. "Angel" started its first season when "Buffy" was going into its fourth season. During the first and maybe second season there were some cross-over episodes. This was back when both shows were still on the WB. But after "Buffy"'s fifth season, the show went to UPN for the last two seasons, And "Angel" stayed on the WB, which pretty much killed any cross-over episodes. While certainly there are episodes, especially on the last season of "Angel" that refference things that happened on "Buffy" they didn't really crossover anymore.
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