Commander Cheng was a major antagonist of the WB Television series Smallville. He was the secondary antagonist in the Season Four episode "Sacred".
Cheng served in the Chinese Military as a Commander and was in charge of a battalion who were stationed in China. In 2005, Lex Luthor hired Cheng to keep track of Jason Teague who arrived in China with a map that lead to one of the three Stones of Power. Lex had followed Jason to China as well to secretly search for one of the mysterious Kryptonian crystals.
In Shanghai, the local police, under Cheng's orders, chased Lex and Jason, who end up getting arrested when they were cornered in an alley. Jason and Lex were tossed into a cell underneath the very temple that the map depicts and Lex was dragged away by the guards, leaving Jason alone.
Lex returned and was thrown back into the cell with signs that he was beaten. When Jason was hauled away to be interrogated, Lex tells him to just give up the information and save himself. Once Jason was gone, Lex turned to the guard and reminds him not to harm Jason when they interrogate him for the information, revealing that Lex had originally set up the arrest.
However, the leader of the soldiers, Cheng, told Lex that he cannot ensure the safety of either of them because someone else has paid him quite a lot more money for information that both Lex and Jason knew and this someone had no qualms about using torture to get the information.
Cheng had the soldiers escort Lex back to the dungeons. Clark Kent and Lana Lang arrived in Shanghai with Lionel's contact, Professor Sen, who lead them to the sacred temple.
While Clark stayed to investigate the throne room, Lana and Professor Sen searched a different part of the temple. While investigating, soldiers immediately burst into the temple and Commander Cheng's soldiers killed Professor Sen but when one of them sees Lana's tattoo, they capture her instead of killing her. Cheng had his soldiers torture Jason and Lex through electrocution for information about the Stone's location.
Unwilling to divulge anything, the soldiers bring in Lana and chain her to a chair. Jason begs that she doesn't know anything but Cheng starts shocking her in hopes that either Jason or Lex will give in to save her.
However, much to the shock of the guards, the pain unleashed Countess Margaret Isobel Thoreaux within Lana, who electrocutes them and broke free with a spell. She then blasted Commander Cheng away with magic, killing him.