Though production has sometimes recycled sets from other television series—"The Benders" made use of a previously-built Western town, while the warehouse-loft set of "Shadow" originated from the series Tru Calling—most episodes usually require the construction of new sets due to the constant change of setting.
Meskipun proses produksi terkadang menggunakan kembali set dari serial televisi yang lain - "Bender" menggunakan Kota Barat yang telah dibangun, sementara loteng gudang dalam episode "Bayangan" berasal dari serial Tru Calling— Sebagian besar episode biasanya membutuhkan pembangunan set baru dikarenakan perubahan rancangan.