King of Atlantis
Depending on which show, Aquaman's origin is different with each and every time he appears on TV. In the Aquaman TV pilot, he and his mother were from Atlantis and were escaping from it when there plane went down and she died, leaving him in the hands of the Coast Guard Officer who responded to their distress call.
Aquaman was a founding member of the Justice League and like his comics counterpart was King of the Seas and king of Atlantis. This version of Aquaman has been notably mocked over the years as he served very little purpose on the show and to the League and only did anything when there was water nearby.
Season Five (2005-2006)
A.C. first appeared in Crater Lake, when Lois Lane was drowning, just seconds ahead of Clark Kent's attempt to save her. However he wasn't in Smallville rescue women from drowning, he was trying to take a down a LutherCorp project, Leviathan that was harming aquatic life. As he flirted with Lois, had a criminal record, and had no info on his origins, Clark naturally suspected he was a criminal, and tried to warn Lois about him but her reply was for him to "buzz off". Clark tailed A.C. and discovers his plan, putting an end to his plan to blow up LutherCorp's marine facility by containing the explosion. Clark's actions caused A.C. to attack him and an underwater battle between the two ensued. Although Clark was thrown out of the water in the battle, a later confrontation between the two would result in A.C. explaining his motives.
The two then unsuccessfully went LutherCorp to convince lex to cancel the Leviathan project, A.C. would get down to do the job himself. He was then captured by Lex-who had a security camera video clip of A.C. investigating the Leviathan Project without scuba gear-after being shot by a tranquilizer dart and being deprived water, he was severely weakened; Lex even commented that given his friendship with Clark, he shouldn't have been surprised at his powers, A.C. responded that Clark didn't know anything about his powers. Clark then arrived and turned the sprinkler system to replenish A.C., then the two of them destroyed the project during Lex's attempt to present it to the Pentagon.
Later at a meeting at the Kent farm, A.C. suggested that Clark join the "Junior Lifeguard Association", but Clark told him he wasn't ready to join the JLA just yet, advising A.C. to be careful as Lex was fully aware of his powers; but A.C. pointed out that the world was three quarters water, and told Clark to stay "super". He then left town to roam the seas, after saying good-bye to Lois at Crater Lake.
Season Six (2006-2007)
A.C. returns to Smallville as a part of Oliver Queen's team of heroes. He was recruited by Oliver while in Japan when Oliver rescued him from being as he put it "ending up in a thousand tuna cans". He teamed up with Bart Allen and Victor Stone to bring down Lex' Level 33.1- a secret floor in a LutherCorp facility designed to and study metahumans. A.C. and Cyborg conducted their part of the mission, while Oliver went out to rescue Clark. A.C. broke into the facility via a waterway beneath it, there inside he met up with Cyborg to planet explosives.
After freeing Bart and Clark and other patients of the project, A.C. and Cyborg detonated the explosives, blowing up the facility. A.C. joins the League in finding other locations of 33.1 across the globe.
Season Eight (2007-2008)
After Clark disappeared following the collapse of the Fortress of Solitude, A.C., Black Canary, and Oliver Queen traveled to the Arctic to search for Clark. While they did not find him , they did find his jacket in the ice. Unbeknownst to them at the time, LutherCorp was also in the Arctic but not searching for Clark but instead searching for Lex. They used Chloe and her new powers to attack A.C. and Dinah and took them prisoner. They were interrogated as to the whereabouts of Green Arrow but neither of them gave in. Clark and Oliver then arrive and save both of them.
Afterwards they decided to split up, with the new threat of Tess Mercer taking over LutherCorp in the absence of Lex.
Season Ten (2010-2011)
Sometime after the events of Season Eight, A.C discovered his true origins as Orin-the ruler of Atlantis and he met the woman who would become his wife, Mera. They worked together as Aquaman and Mera and when the Goverment passed the Vigilante Registration Act (VRA), they discovered the government had set up secret containment facilities in oil rigs, underwater. They destroyed one of them and caught the attention of the head of the VRA, Slade Wilson and his teammates, Clark and Oliver.
Aquaman was previously considered an urban legend for years until he was kidnapped by Lex Luthor. He called out telepathically to the sea and told all sea creatures to attack the "surface dwellers". The attack of humanity was stopped by Lois Lane and Superman.
After an attempt was made on his life by Deadshot, Aquaman would aid the League in uncovering the identity of who placed the hit on him. When he returned home to Atlantis, he found that that the hit was made by his brother Orm. Orm had long been jealous of his brother and wanted the throne for himself. With the help of the Justice League, Aquaman killed his brother but lost his left hand in the process.
Sometime after the events of Justice League, Aquaman and Mera had a daughter called Marina who became a member of the Justice League Unlimited as Aquagirl in the 2060's. Though he would not see that as he disappeared in the 2040's.
Aquaman has made several appearances on the show, most often as the butt of a joke made by Peter. In the episode Baby Not on Board, a woman is raped on the beach and Aquaman is in the water, unable to use his powers on land. He throws a starfish in attempt to stop the rape but fails as the Starfish does not help. In the episode Hannah Banana, Chris and the Evil Monkey are fishing and catch Aquaman and then proceed to eat him.