Zombies/Robots, Can you combine they're coming to get you and zapbot?
No, only one Zapbot can come from the discard pile.

While the text is unclear, AEG has issued an official ruling on BoardGameGeek, here.


  It only lets you play a single minion that way, not whenever you play a minion.


That is, you can make one minion play each turn on the base with "They're Coming to Get You" from the discard pile.

However, playing a Zapbot from your discard still triggers its ability, which would allow you to play additional minions from your hand.