- 1 decade agoFavorite Answer
Main reason is the rating is not good in US. When the show first started, it attracted 17 million viewers, but it dropped to only 9 million viewers when the show showed up to episode 10. So ABC dropped the show.
Rumors said that another channel, the CW channel, would pick invasion up for its 06-07 schedule. However, nothing happened.
For details, you may refer to the site below, you may find the detail infor about the Invasion Incident.
If you really want to show back, you may sign at saveinvasion.net, to save the show wither other Invasion fans.
2006-10-19 16:30:23 補充：
Sorry for answering in English as today my computer's chinese input function is out of order..... Hope you don't mind.Source(s): Myself